Question 1

Which compound has the highest boiling point&#8230;&#8230;&#10;A)Acetone&#10;B)Diethyl ether&#10;C)Methanol&#10;D)Ethanol

Accepted Answer

Ethanol has the highest boiling point due to its ability to form strong hydrogen bonds, which require more energy to break compared to the other compounds listed.

Question 2

Dehydration of ethanol gives&#8230;&#8230;&#10;A)Acetic acid&#10;B)Ethane&#10;C)Ethylene&#10;D)Acetylene

Accepted Answer

Dehydration of ethanol typically produces ethylene (also known as ethene) through the elimination of water (H2O) from the ethanol molecule.

Question 3

Absolute ethanol cannot be obtained by simple fraction of a solution of ethanol and water because&#8230;..&#10;A)Their B.P.'s are very nearer&#10;B)Ethanol remains dissolved in water&#10;C)They form a constant boiling mixture&#10;D)Ethanol molecules are solvated

Accepted Answer

They form a constant boiling mixture, which means that the composition of the vapor phase is the same as the liquid phase at a certain temperature, preventing the separation of pure components by simple distillation.

Question 4

In esterification, the reactivity of alcohols is &#8230;&#8230;&#10;A)1&#176; > 2&#176; > 3&#176;&#10;B)3&#176; > 2&#176; > 1&#176;&#10;C)Same in all cases&#10;D)None of these

Accepted Answer

In esterification reactions, primary (1°) alcohols are more reactive than secondary (2°) alcohols, which in turn are more reactive than tertiary (3°) alcohols. This is because the steric hindrance increases and the accessibility of the hydroxyl group decreases as the degree of the alcohol increases, making the reaction with the acid more difficult.

Question 5

Methanol and ethanol are distinguished by the&#8230;&#8230;.&#10;A)Action of HCl&#10;B)Iodoform test&#10;C)Solubility in water&#10;D)Sodium

Accepted Answer

The iodoform test is a chemical reaction used to distinguish between methanol and ethanol. Ethanol reacts with iodine in the presence of a base to form a yellow precipitate of iodoform, while methanol does not give this reaction.

Question 6

Ethyl alcohol exhibits acidic character on reacting with&#8230;&#8230;.&#10;A)Acetic acid&#10;B)Sodium metal&#10;C)Hydrogen iodide&#10;D)Acidic potassium dichromate

Accepted Answer

Ethyl alcohol reacts with sodium metal to form sodium ethoxide and hydrogen gas, demonstrating its acidic character by donating a proton.

Question 7

Which of the following is not characteristic of alcohols&#8230;&#8230;&#10;A)They are lighter than water&#10;B)Their boiling points rise fairly uniformly with increasing molecular weight&#10;C)Lower members are insoluble in water and organic solvents but solubility regularly increases with molecular weight&#10;D)Lower members have pleasant smell and burning taste, while higher members are odourless and tasteless

Accepted Answer

Lower members of alcohols are actually soluble in water due to their ability to form hydrogen bonds with water molecules. This solubility decreases with increasing molecular weight as the hydrophobic hydrocarbon chain becomes larger, making the molecule less compatible with water.

Question 8

By means of calcium chloride which of following can be dried&#8230;&#8230;&#10;A)Methanol&#10;B)Ethanol&#10;C)Both (a) and (b)&#10;D)None of these

Accepted Answer

Calcium chloride cannot be used to dry methanol or ethanol as it forms complexes with alcohols, making it ineffective for drying them.

Question 9

Dimethyl ether and ethyl alcohol are &#8230;..&#10;A)Branched isomer&#10;B)Position isomer&#10;C)Functional isomer&#10;D)Tautomer

Accepted Answer

Dimethyl ether (CH3-O-CH3) and ethyl alcohol (CH3CH2OH) have the same molecular formula (C2H6O) but different functional groups (ether and alcohol, respectively), making them functional isomers.

Question 10

The process of manufacture of absolute alcohol from rectified spirit is&#8230;&#8230;.&#10;A)Fractional distillation&#10;B)Steam distillation&#10;C)Azeotropic distillation&#10;D)Vacuum distillation

Accepted Answer

Azeotropic distillation is used to produce absolute alcohol from rectified spirit because it involves breaking an azeotrope to remove water, which cannot be completely separated by simple fractional distillation due to the formation of a constant boiling mixture with ethanol.

Question 11

When ethyl alcohol reacts with acetic acid, the products formed are&#8230;..&#10;A)Sodium ethoxide + hydrogen&#10;B)Ethyl acetate + water&#10;C)Ethyl acetate + soap&#10;D)Ethyl alcohol + water

Accepted Answer

The answer of When ethyl alcohol reacts with acetic acid,...

Question 12

Methanol and ethanol are miscible in water due to&#8230;..&#10;A)Covalent character&#10;B)Hydrogen bonding character&#10;C)Oxygen bonding character&#10;D)None of these

Accepted Answer

The answer of Methanol and ethanol are miscible in water...

Question 13

Which of the following is most soluble in water&#8230;&#8230;&#10;A)Normal butyl alcohol&#10;B)Isobutyl alcohol&#10;C)Tertiary butyl alcohol&#10;D)Secondary butyl alcohol

Accepted Answer

The answer of Which of the following is most soluble...

Question 14

If ethanol dissolves in water, then which of the following would be done&#8230;&#8230;&#10;A)Absorption of heat and contraction in volume&#10;B)Emission of heat and contraction in volume&#10;C)Absorption of heat and increase in volume&#10;D)Emission of heat and increase in volume

Accepted Answer

The answer of If ethanol dissolves in water, then which...

Question 15

When rectified spirit and benzene are distilled together, the first fraction obtained is&#8230;&#8230;&#10;A)A ternary azeotrope&#10;B)Absolute alcohol&#10;C)A binary azeotrope&#10;D)Denatured spirit

Accepted Answer

The answer of When rectified spirit and benzene are distilled...

Question 16

Alcohols combine with acetylene in the presence of mercury compounds as catalyst to form&#8230;&#8230;.&#10;A)Acetals&#10;B)Xanthates&#10;C)Vinyl ethers&#10;D)None of the above

Accepted Answer

The answer of Alcohols combine with acetylene in the presence...

Question 17

The boiling point of methanol is greater than that of methyl thiol because&#10;A)There is intramolecular hydrogen bonding in methanol and intermolecular hydrogen bonding in methyl thiol&#10;B)There is intermolecular hydrogen bonding in methanol and no hydrogen bonding in methyl thiol&#10;C)There is no hydrogen bonding in methanol and intermolecular hydrogen bonding in methyl thiol&#10;D)There is intramolecular hydrogen bonding in methanol and no hydrogen bonding in methyl thiol

Accepted Answer

The answer of The boiling point of methanol is greater...

Question 18

At 530 K , glycerol reacts with oxalic acid to produce &#8230;&#8230;.&#10;A)Allyl alcohol&#10;B)Formic acid&#10;C)Glyceraldehyde&#10;D)Glycerol monooxalate

Accepted Answer

The answer of At 530 K , glycerol reacts with...

Question 19

With anhydrous zinc chloride, ethylene glycol gives&#8230;&#8230;.&#10;A)Formaldehyde&#10;B)Acetylene&#10;C)Acetaldehyde&#10;D)Acetone

Accepted Answer

The answer of With anhydrous zinc chloride, ethylene glycol gives&#8230;&#8230;.&#10;A)Formaldehyde&#10;B)Acetylene&#10;C)Acetaldehyde&#10;D)Acetone...

Question 20

Amongst the following, HBr reacts fastest with&#8230;&#8230;.&#10;A)Propane-1-ol&#10;B)Propane-2-ol&#10;C)2-methyl propane-1-ol&#10;D)2-methyl propane-2-ol

Accepted Answer

The answer of Amongst the following, HBr reacts fastest with&#8230;&#8230;.&#10;A)Propane-1-ol&#10;B)Propane-2-ol&#10;C)2-methyl...

Question 21

Which alcohol reacts with fatty acids to form fats&#8230;&#8230;.&#10;A)Ethanol&#10;B)Glycerol&#10;C)Methanol&#10;D)Isopropanol

Accepted Answer

The answer of Which alcohol reacts with fatty acids to...

Question 22

Which will dehydrate easily&#8230;&#8230;.&#10;A)3-methyl-2-butanol&#10;B)Ethyl alcohol&#10;C)2-methyl propane-2-ol&#10;D)2-methyl butanol-2

Accepted Answer

The answer of Which will dehydrate easily&#8230;&#8230;.&#10;A)3-methyl-2-butanol&#10;B)Ethyl alcohol&#10;C)2-methyl propane-2-ol&#10;D)2-methyl butanol-2...

Question 23

On reaction with hot conc. H₂SO₄ which one of the following compounds loses a molecule of water…. A)CH₃COCH₃ B)CH₃COOH C)CH₃OCH₃ D)CH₃CH₂OH

Accepted Answer

The answer of On reaction with hot conc. H₂SO₄ which...

Question 24

C₂H₅OH can be differentiated from CH₃OH by….. A)Reaction with HCl B)Reaction with 3 NH C)By iodoform test D)By solubility in water

Accepted Answer

The answer of C₂H₅OH can be differentiated from CH₃OH by….. A)Reaction...

Question 25

Glycerol is used in the manufacture of&#10;A)Dynamite&#10;B)Varnish&#10;C)Paints&#10;D)Soft drinks

Accepted Answer

The answer of Glycerol is used in the manufacture of&#10;A)Dynamite&#10;B)Varnish&#10;C)Paints&#10;D)Soft...

Deck 7: Alcohols Characteristics and Reactivity