Alcohols, Phenols and Ethers Quiz - ICSE Class 12 Chemistry

Free practice quiz: Alcohols, Phenols and Ethers (ICSE Class 12 Chemistry). 10 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 12 Chemistry practice quiz has 10 multiple-choice questions on Alcohols, Phenols and Ethers, and 10 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is an incorrect statement regarding ethers?

   1. Ethers are generally less polar than alcohols.
   2. Ethers are good solvents for many organic compounds.
   3. Ethers can be prepared by the acid-catalyzed hydration of alkenes.
   4. Ethers are relatively unreactive towards most common reagents.
   Show answer

   Answer: C. Ethers can be prepared by the acid-catalyzed hydration of alkenes.

   Acid-catalyzed hydration of alkenes produces alcohols, not ethers. Ethers are typically prepared by Williamson ether synthesis or by the dehydration of alcohols.

2. Which of the following alcohols is chiral?

   1. Ethanol
   2. Propan-1-ol
   3. Propan-2-ol
   4. Butan-2-ol
   Show answer

   Answer: D. Butan-2-ol

   Chirality arises from a carbon atom bonded to four different groups. In butan-2-ol, the carbon atom at position 2 is bonded to a methyl group, a hydrogen atom, a hydroxyl group, and an ethyl group, making it a chiral center.

3. Which functional group is present in phenol?

   1. Alcoholic hydroxyl
   2. Phenolic hydroxyl
   3. Ether
   4. Carboxylic acid
   Show answer

   Answer: B. Phenolic hydroxyl

   Phenol has a hydroxyl (-OH) group directly attached to an aromatic benzene ring. This is specifically termed a phenolic hydroxyl group, which differs in properties from an alcoholic hydroxyl group attached to an aliphatic carbon.

4. Which of the following is NOT a characteristic reaction of phenol?

   1. Electrophilic substitution on the ring
   2. Reaction with sodium metal
   3. Acidity and salt formation
   4. Oxidation to a ketone
   Show answer

   Answer: D. Oxidation to a ketone

   Phenol undergoes electrophilic substitution readily due to the activating effect of the -OH group. It reacts with sodium metal to form sodium phenoxide. It is acidic and forms salts with bases. However, phenol cannot be oxidized to a ketone because it lacks the necessary structure. Oxidation of phenol under strong conditions typically leads to ring cleavage or quinone formation, not a simple ketone.

5. The dehydration of propan-1-ol using concentrated H2SO4 at 170°C yields:

   1. Propene
   2. Propanal
   3. Propan-2-ol
   4. Dipropyl ether
   Show answer

   Answer: A. Propene

   When primary alcohols like propan-1-ol are heated with concentrated sulfuric acid at 170°C, they undergo intramolecular dehydration (elimination) to form alkenes. In this case, propene is formed.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The reaction of phenyl acetate with HI at high temperature leads to:
2. The reaction of phenol with chloroform in alkaline medium produces:
3. The reaction of propene with cold, dilute, alkaline KMnO4 solution produces:
4. Which of the following ethers is most likely to undergo cleavage by heating with HI via an SN1 mechanism?
5. What is the correct order of increasing acidity for the following compounds?

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