The Rf value for a spot in a TLC experiment if the solvent moved 14.9 cm and the spot moved 6.5 cm from the origin is 0.43.
What is solvent?
A solvent is a substance that can dissolve an insoluble solute and create a solution. Solvents are often liquids, although they can also be solids, gases, or supercritical fluids. The amount of solute that dissolves in a given volume of solvent changes depending on the temperature. Dry cleaning, paint thinners, nail polish removers, glue solvents, spot removers, detergents, and scents are a few applications for solvents. Polar molecules can float in water. The most used solvent is water because it can virtually completely dissolve all solutes.
[tex]Rf = \frac{Distance traveled by the compound}{Distance traveled by the solvent front}[/tex]
[tex]=\frac{6.5}{14.9} \\=0.43[/tex]
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In the following reaction:
Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO₂(g) + 2H₂O
(1) which of the following statements about copper is true?
A Copper undergoes reduction and its oxidation number decreases.
B Copper undergoes oxidation and its oxidation number decreases.
C Copper undergoes reduction and its oxidation number increases.
D Copper undergoes oxidation and its oxidation number increases.
Answer:
Copper undergoes oxidation and its oxidation number increases.
Explanation:
Copper, here, gains an oxygen molecule on the products' side, so it gets oxidized. When oxidized, the oxidizing number increases, so your answer is D.
if you had to make a 5 mm solution of nacl in water and you needed 250 ml, how many grams of nacl would you need? (the molecular weight of nacl is 58.44 g/mole.
5mM of NaCl in water requires [tex]73.05 grams[/tex] of sodium chloride.
Salt, also known as sodium chloride, is an ionic compound with the chemical formula NaCl, which indicates a 1:1 ratio of sodium and chloride ions. However, in addition to sea salt, other chemical salts are present. 39.34 g Na and 60.66 g Cl have molar weights of 22.99 and 35.45 g/mol in 100 g of NaCl, respectively. Sodium chloride is the salt that most significantly contributes to the salinity of seawater and the extracellular fluid of many multicellular organisms. In its edible form, table salt, often known as salt, is commonly used as a condiment and food preservative.
NaCl millimoles equal 5 mM.
One mole weighs[tex]58.44 milligrams.[/tex]
The ratio of 5 millimoles of NaCl to
[tex]= 5 *58.44 mg \\\\ =292.2 mg[/tex]
To make a 250 ml solution, you would need[tex]292.2 * 250 ml = 73,050 mg[/tex] of NaCl
[tex]73.05 g[/tex] of sodium chloride is equivalent to [tex]73,050 mg.[/tex]
If you used 250 ml and [tex]73.05 g[/tex] of NaCl to produce a 5 mm solution in water
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how many different kinds of reactions could a single enzyme be involved in?
when 50.08 g of 1.00 m naoh at 23 °c is added to 50.22 g of 1.00 m hcl at 23 °c, the resulting temperature of the mixture is 29.7 °c. is the reaction endothermic or exothermic?
Just after addition of the NaOH and HCl, the mixture's temperature rose form 23 °C to 29.7 °C, showing that the process is exothermic.
What are exothermic and endothermic processes?Exothermic refers to chemical reactions that results in the release. When bonds are generated in the products of exothermic events, more energy is produced than is required the break the bonds between the reagents. Exothermic reaction refers to chemical methods that either utilize or absorb energy.
Is endothermy a positive idea?Heat of reaction is often high in endothermic processes (qrxn>0). Changes in energy levels between exothermic and endothermic events result in variations in enthalpy (H), which is the total of all kinetic and potential energies.
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Is the following sentence true or false? When the temperature of water drops to 0°C, its molecules form regular patterns, which are crystals.
The statement; When the temperature of water drops to 0°C, its molecules form regular patterns, which are crystals is true
What is the crystal structure of ice?
The crystal structure of ice is hexagonal. Ice forms a crystalline lattice structure, with the oxygen atoms of each water molecule bonded to four neighboring oxygen atoms. The hexagonal arrangement of the water molecules in ice results in a highly organized, closely packed arrangement with a low density.
Thus, we know that when we remove heat from water, there is a lining up of the water molecules and this leads to the crystal structure of ice.
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Aldehydes have central carbon bound t0 two other carbons true false Question 0.33 pts Carboxylic acids contain carbonyl group ano what other group? Jmine phosphate hydroxyi Question 5 0.33 pts How Men electrons in total can Hydrogen have?
The statement is false that Aldehydes have central carbon bound to two other carbons. Carboxylic acids contain carbonyl group and hydroxyl group. 2 electrons in total hydrogen have.
Why is it referred to as aldehyde?All aldehydes possess a double bond between carbon and oxygen, which is termed to as the carbonyl group. Many aldehydes have pleasant aromas, and in principle, they are made from alcohols by the process of dehydrogenation (removal of hydrogen), which is how the word "aldehyde" originated.
How are carboxylic acids structured?An organic acid that contains a carboxyl group (C(=O)OH) connected to an R-group is termed to as a carboxylic acid in organic chemistry. A carboxylic acid's general formula is RCOOH or RCO 2H, wherein R stands for an alkyl, alkenyl, aryl, or other group. Carboxylic acids are usually present.
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Aldehydes have central carbon bound to two other carbons true/false.
Carboxylic acids contain carbonyl group and what other group?
A)Amine
B)Phosphate
C)hydroxyl
How many electrons in total can Hydrogen have?
A)8
B)2
C)4
D)6
why is my car overheating but it has coolant in it?
The vehicle is smoking beneath the hood but without overheating because a specific fluid has been put onto the engine.
What do you mean when you say "fluid"?Any kind of liquids, gases, or essentially any other materials that, when stressed, continuously change shape and cannot bear radial or shear forces at rest are considered fluids.
Exactly what do you mean by fluid properties?Some of the most fundamental concepts in fluid properties include thermostat, density, and composition. Mass and volume are examples of extensive characteristics, or properties that depend on the amount of material present. Intense properties include things like temperature, pressure, and density, for instance.
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PLEASE PLEASE HELPPPPPPPPPPPPPP
When a person advertises a product, she is (1 point)
Responses
marketing.
marketing.
communicating.
communicating.
delivering.
delivering.
unloading.
Marketing is the correct answer .
What is Marketing ?
Marketing is the process of creating, communicating, delivering, exchanging, and managing offerings that have value for customers, clients, and society as a whole. It involves identifying the needs and wants of customers and developing products or services to meet those needs. Marketing also involves promoting and selling products or services, as well as managing customer relationships to ensure customer satisfaction and loyalty. Marketing encompasses a wide range of activities, including market research, product development, advertising, sales, pricing, and distribution. It is a strategic function that helps organizations understand and connect with their target audience, and effectively communicate the value of their offerings.
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A student describes a substance as lacking a definite shape. The description also states that the particles of matter are close to each other but still able to flow past each other. Which type of substance is the student mostlikely describing?
answer choices
O solid
O liquid
O mixture
O compound
Liquid is the states that the particles of matter are close to each other but still able to flow past each other.
What five qualities does a liquid have?The amount of liquids is consistent, but their shape is not.You can compress liquids. Compressed them requires a significant amount of high pressure.Relative to solids, liquids have lower densities.Relative to solids, intermolecular forces of attraction are weaker.The particles have been separated by a significant margin.Explain what is the liquid state?A form of matter known as a liquid has special properties that make it less stiff than a solid but more rigid than a gas. Unlike a solid, which has a defined shape, a liquid can flow. In comparison, a real fluids on the shape of the container it is kept in. There is a definite loudness to it. Although being free to move over one another, particles are nevertheless drawn toward each other.
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An electron in an orbital that penetrates closer to the nucleus will always experience more shielding than an electron in an orbital that does not penetrate as far.a. Trueb. False
It is untrue that an electron in an orbital that enters the nucleus more deeply would always be shielded more than an electron in an orbital that penetrates less deeply.
Are electrons that are nearer the nucleus subject to more shielding?Since the valence electrons are further from the nucleus, the force of attraction is weaker for them. By rejecting the outer rings, or shielding, the core electrons reduce the 1:1 ratio.
Which orbital provides the best shielding for an electron?As a result, electrons in a s orbital of the same shell have more shielding power than electrons in a p or d orbital. Additionally, the very penetrating nature of s orbitals makes them less effective at protecting electrons from various orbitals of the electron.
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if the atomic mass for copper on the periodic table is 63.55, are there more atoms of 63/29 cu or 65/29 cu in a sample of copper? there are in a sample of copper because the mass number of copper, which is 63.55 amu , is the mass number of the isotope present in the highest percentage.
Yes, ⁶³₂₉Cu are more atoms them⁶⁵₂₉Cu.
There are more atoms of ⁶³₂₉Cu in a sample of copper because the mass number of copper, which is 63.55 amu is closer to the mass number of an isotope present in the highest percentage.
Copper has two isotopes: Cu-63 = x% and Cu-65 = (100 – x)%
Average mass = (Atomic mass of Cu-63 x %Cu-63) + (Atomic mass of Cu-65 x %Cu-65)
63.55 = (63 x (x%)) + (65 x (100 – x)%
63.55 = 0.63x + 65 – 0.65x
0.02x = 65 – 63.55
0.02x = 1.45
x = 1.45/0.02
x = 72.5
Abundance of Cu-63 = 72.5%
Abundance of Cu-65 = (100 – 72.5)% = 27.5%
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when methanol dissolves in water, what IMFs are overcome in the solvent?
Hydrogen bonding, dipole-dipole, as well as LDF IMFs are broken down in the solvent whenever methanol dissociates in water.
What is an intermolecular force between dipoles?The positive terminal of the battery about one polar molecule interacts end of this other positive charge are attracted to one another by dipole-dipole forces. Strengths of dipole-dipole pressures per mole vary between 5 kJ to 20 kJ.
How can I locate a dipole-dipole?When there is discrepancy in the electronegativity of two atoms, you have one dipole moment. If you had distinct elect negativities, such as delta positives and delta negative, then you should probably just keep in mind that the molecules between these charges would indeed be dipole-dipole.
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Describe the cycling of carbon in the carbon cycle.
The carbon cycle is nature's way of recycling carbon atoms that enter organisms on Earth from the atmosphere and return to the atmosphere again and again. Most of the carbon is stored in rocks and sediments, the rest in the ocean, atmosphere and organisms.
The pathways show the use of carbon compounds in various activities and sources due to their natural origin. The main purpose of the cycle is to balance carbon within the ecosystem from biotic and abiotic factors. As carbon passes through biotic and abiotic factors, the following happens:
The process by which plants and other autotrophs produce food requires carbon dioxide as the main component, thus providing the organism with the essential glucose and oxygen.The process of inhaling and exhaling gases from the body is called respiration. Digested food and inhaled oxygen in the organism's body release carbon dioxide into the environment. Dead plants, microorganisms, and animals break down into smaller organic and inorganic compounds, releasing carbon dioxide into the atmosphere and soil.Learn more about Carbon Cycle
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which observation(s) reflect(s) colligative properties? (i) a 0.85 m fecl3 aqueous solution has a lower vapor pressure than that of a 0.85 m c12h22o11 aqueous solution. (ii) a paper clip floats on the surface water in a container. (iii) a 0.15 m al(no3)3 aqueous solution boils at a higher temperature than pure water.
The observation that reflects colligative properties is (i) a 0.85 m FeCl3 aqueous solution has a lower vapor pressure than that of a 0.85 m C12H22O11 aqueous solution.
Colligative properties are properties of a solution that depend on the concentration of solute particles but not on the identity of the solute particles. Examples of colligative properties include vapor pressure lowering, boiling point elevation, and freezing point depression.
In this case, (i) shows a difference in vapor pressure between two solutions with different solutes but the same concentration, which is a reflection of vapor pressure lowering, a colligative property.
(ii) a paper clip floating on the surface of water in a container does not reflect a colligative property. This observation is likely due to the fact that the paper clip is less dense than water and therefore floats on the surface.
(iii) a 0.15 m Al(NO3)3 aqueous solution boiling at a higher temperature than pure water reflects boiling point elevation, another colligative property. The higher boiling point of the solution indicates that there are more solute particles present, which raises the boiling point of the solution.
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which structural feature most likely accounts for the signals around 7 ppm in the given 1h nmr spectrum
The correct option is B. A disubstituted aromatic ring structural feature most likely accounts for the signals around 7 ppm in the given 1h nmr spectrum.
Nuclear magnetic resonance (NMR) spectroscopy is an advanced characterization approach. it's miles used to decide the molecular structure on the atomic degree of a pattern.it's far based on the reality that the nuclei of most atoms show spin and all nuclei are electrically charged. NMR-spectroscopy is primarily based on the absorption of electromagnetic radiation within the radiofrequency region 3kHz-300 GHz.
NMR spectroscopy is used to decide the structure of proteins, amino acid profile, carotenoids, natural acids, lipid fractions, and the mobility of the water in foods. NMR spectroscopy is likewise used to pick out and quantify the metabolites in ingredients. the dimensions are made greater workable with the aid of expressing it in elements consistent with million (ppm) and are independent of the spectrometer frequency. it's miles frequently convenient to explain the relative positions of the resonances in an NMR spectrum.
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Completed Question:
which structural feature most likely accounts for the signals around 7 ppm in the given 1h nmr spectrum
A). A cis disubstituted alkane.
B). A disubstituted aromatic ring.
C). A monosubstituted alkane.
D). A trans-disubstituted alkane.
E). A monosubstituted aromatic ring.
what is the pressure of a container with 2 moles of gas, a temperature of 500 k, and a volume of 2 l
The pressure of a container with 2 moles of gas, a temperature of 500 k, and a volume of 2 l is 4.1 atm
The pressure, volume, number of moles or molecules, and temperature are all related by this law. In essence, the link between these four separate variables is provided by the ideal gas law. the rule that states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gram of an ideal gas.
pV = nRT
where
Volume of water V = 2L
Temperature T = 500K
Pressure= P
n= Number of moles of gas = 2 moles
R = 0.0082 atm dm³ K⁻¹mol⁻¹
pV = nRT
P = nRT/V
P = 2 moles 0.0082 atm dm³ K⁻¹mol⁻¹ 500K / 2L
P = 4.1 atm
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According to the dramatic exposition at the beginning of the play, what fueled the Salem witch hunt depicted in the play?
People who had "wronged" them want revenge and their own brand of justice.
What do you call anyone who is dramatic?Melodramatic is often compared to theatrical, histrionic, and theatrical. Melodramatic conjures up excessive emotionalism or improper theatricalism, even if all these adjectives refer to "has a tone or an impact like that of staged plays."
What causes somebody to be so dramatic?Acting excessively theatrical is a symptom of hysterical personality disorder (HPD). People who have HPD may well have superficial, erratic moods and rely on their outside looks to attract attention. They could also be sensitive to other influences and struggle to develop their own personalities.
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How many atoms of oxygen are in 4.5x10^23 formula units of kmno4?
The answer of 8.1 x 10^25 O atoms is derived from stechiometric calculations.
Specifically, it is the result of calculating the number of oxygen atoms in 4.5 x 10^23 formula units of KMnO4. This calculation involves converting the number of formula units to moles of KMnO4, and then using the molar ratio of KMnO4 to O atoms to determine the number of oxygen atoms present. The calculation can be expressed as follows:
4.5 x 10^23 formula units of KMnO4 * (1 mole KMnO4 / 158.068 g KMnO4) * (1 mole O atoms / 1 mole KMnO4) * (6.022 x 10^23 O atoms / 1 mole O atoms) = 8.1 x 10^25 O atoms.
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How many
moles concentrated nitric acid were used? Recall that 5 mL of 16 M HNO3
were used. are used? Concentrated nitric acid is 16.0 M. Show work!
Moles nitric acid =????
Please I need help
Answer:
0.08 moles
Explanation:
The number of moles of nitric acid used can be calculated using the formula:
moles = concentration x volume
where concentration is in moles/liter and volume is in liters.
Since the volume of nitric acid used is given in milliliters (5 mL), we first need to convert it to liters:
5 mL = 5 x 10^-3 L
Now, we can calculate the number of moles of nitric acid used:
moles = 16.0 M x (5 x 10^-3 L) = 0.08 moles
So, 0.08 moles of concentrated nitric acid (16 M) were used.
gases behave most ideally at choose... temperatures and choose... pressures.
High temperatures and low pressures
Explanation:Ideal gas is a hypothetical state of gases that allows for easier calculations with gases.
Ideal Gas Assumptions
There are 5 assumptions that scientists make to apply ideal gas laws.
Gases are constantly moving in linear motionThere are no intermolecular forces (IMFs) between gas particlesThe volume of gas particles is negligibleParticles have perfectly elastic collisionsKinetic energy is proportional to temperature.Note that elastic collisions mean that no energy is lost through the collisions of particles. Additionally, very few gases actually follow these assumptions. However, sometimes the variation from these assumptions is small enough that the effects are negligible.
Most Ideal Behavior
Whilst ideal gases are not real, small gas particles at high temperatures and low pressures act mostly ideal. Gases at high temperatures move very quickly; this allows their motion to be mostly linear and for less energy to be lost in collisions.
Also, at low pressures, gas particles are further apart. The increased distance between the gas particles decreases the effect of IMFs, making gases more ideal. Additionally, the ratio of empty space to gas particles is larger when the volume is larger. This means that the volume of the particles is negligible.
Overall, high temperatures and low pressures help gases behave most ideally.
a metal crystallizes with a face-centered cubic lattice. the edge of the unit cell is 442 pm. what is the diameter (in pm) of the metal atom?
The diameter (in pm) of the metal atom is 312.54 pm
Atoms are organized in a cube to form a face-centered cubic unit cell structure, with six extra complete atoms placed in the center of each cube face and a fraction of an atom at each of the cube's four corners. The atoms in the cube's corner are shared by eight more unit cells.
We must apply the equation for a face-centered cubic laticce to respond to this question:
Edge length = 8 R
where R is the atom's radius.
Replacing:
442pm = √8 R
The atom's radius is R = 156.27pm.
diameter = 2 radii for as.
The metal atom's diameter is:
156.2 x 2 = 312.54 pm
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How is the pressure of the vaporized liquid determined in this experiment?
At a measured temperature and barometric pressure, the liquid is converted to vapor and released into a set volume vessel. An unknown liquid is vaporized in a bath of measured-temperature boiling water.
How is the molar mass of a volatile liquid determined by the gas law experiment?The ideal gas law, PV = nRT, is frequently used to calculate the molar mass of a substance if it is a volatile liquid. The liquid is easily transformed into a gas since it is highly flammable. You can gauge the material's volume, pressure, and temperature while it's in the gaseous state.
How is vapor pressure determined?A tool used to measure pressure is called a manometer. A glass tube in the shape of a U that is partially filled with liquid makes up a typical simple manometer. Due to its high density, mercury is usually a liquid.
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The Law of Conservation of Mass states that if 6 grams react in a chemical reaction, then _____ grams are present after the reaction.
a.
12 grams
b.
9 grams
c.
6 grams
d.
3 grams
Answer:
c. 6 grams...................
in each compound below, two protons are color-coded (red and blue). determine which of the two protons is more acidic, and explain your choice:
The correct answer is: The blue proton is more acidic because its conjugate base is less stable, with a negative charge on the more electronegative oxygen atom. Option C.
In general, the proton that is more accessible to a base will be more acidic. In this case, the red proton is more accessible and therefore more acidic.
This is because the blue proton is surrounded by the four atoms of the carbon chain, giving it less opportunity to interact with a base.
On the other hand, the red proton has a hydrogen atom on one side and an oxygen atom on the other side, making it more accessible to a base and therefore more acidic.
The acidity of a proton is determined by its access to a base. When a proton is surrounded by other atoms, its access to a base is limited, making it less acidic than a proton with fewer atoms around it. This is why the red proton in the compound is more acidic than the blue proton.
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a can of cola contains about 39 grams of sucrose, c12h22o11. how many moles of sucrose does this represent?
Therefore, there are approximately 0.1135 moles of sucrose in a can of cola.
Sucrose, also known as table sugar, has the chemical formula [tex]C_{12}H_{22}O_{11}[/tex]. The molar mass of sucrose can be calculated by adding up the atomic masses of each element in the molecule. Carbon, hydrogen, and oxygen are the main elements in sucrose and each have a unique atomic mass. By multiplying the number of atoms of each element by its atomic mass, we get the total molar mass of the molecule, which is 342.34 g/mol. To find the number of moles of sucrose in a sample, we divide the mass of the sample by its molar mass. In this case, 39 g of sucrose represents 0.1135 moles.
[tex](12*12.01) + (11.16.00) = 342.34 g/mol[/tex]
So the number of moles of sucrose is:
[tex]\frac{39}{342.34} = 0.1135[/tex]
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When methanol dissolves in water, what imfs are overcome in the solute?
Answer: it's able to overcome hydrogen bonding, dipole-dipole interactions, and LDFs
Explanation:
can a compound be broken down into simpler substances (true or False)
Answer:
True
Explanation:
Compounds are a certain thing made by either 2 or more substances. So if we were to break down a compounds, we would receive at least 2 simpler substances.
-Hope this helped
an n-alkane of molecular formula c28h58 has been isolated from a certain fossil plant. write a condensed structural formula for this alkane.
The task is to write a condensed structural formula for an n-alkane with the given molecular formula.An n-alkane is an unbranched alkane.CH3(CH2)26CH3.
Which four forms of hydrocarbons are there?Alkanes, alkenes, alkynes, & aromatic hydrocarbons are the four subcategories that are typically used to classify hydrocarbons. These compounds might have relatively basic structures or relatively complicated ones.
The first four hydrocarbons are what?Typically, hydrogen atoms form a protective shell around carbon atoms to form molecules.Hydrocarbons are categorized into four primary groups: alkanes, alkenes, alkynes, and aromatic hydrocarbons.
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what type of bonds does carbon typically form to create biomolecules?
Four electrons make the outer shell of carbon. As a result, it may join with four other molecules or atoms to create covalent bonds. Propane is the most basic organic material molecule (CH4).
What is carbon?The nucleus of an atom is made up of six protons and six protons, and it is encased in six electrons. The very first two electrons must inhabit the innermost atomic orbital as according quantum mechanics, whereas the other four protons have vibration modes that only partly fill the first standard and 3-second primary orbitals.
Why is it alluded to as carbon?The Latin word exc, which meaning "coal," is whence carbon gets its name. The hardest or softest known natural materials, however, are gems and graphite. Their nanocrystals are the only distinction between them.
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draw all the structures of the isomeric alcohols (c5h12o) that can be prepared by reduction of a ketone using sodium borohydride?
There are three structures possible-
Pentan-1-olPentan-2-olPentan-3-olStructures of Isomeric Alcohols
Here are the structures of the isomeric alcohols (C5H12O) that can be prepared by reduction of a ketone using sodium borohydride:
Pentan-1-ol:
H3C-CH2-CH2-CH2-CH2-OH
Pentan-2-ol:
H3C-CH(OH)-CH2-CH2-CH3
Pentan-3-ol:
H3C-CH2-CH(OH)-CH2-CH3
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