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Punjab Board Class 12 (PSEB) Chemistry — practice by topic

Browse 30 questions across 3 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Alcohols Phenols and Ethers (30)Chemistry (30)Class 12 Chemistry (30)

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A compound with a hydroxyl group joined to a saturated carbon chain is an:Read the answer and worked solution →A compound with a hydroxyl group joined directly to a benzene ring is a:Read the answer and worked solution →Dimethyl ether shows the family in which oxygen links two carbon groups. It is an:Read the answer and worked solution →A compound carrying two hydroxyl groups is described as:Read the answer and worked solution →

Worked practice questions

A compound with a hydroxyl group joined to a saturated carbon chain is an:

  1. Alcohol
  2. Aldehyde
  3. Ammonia
  4. Alkanes
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Correct answer: A. Alcohol

1. The functional group here is the hydroxyl group. 2. It sits on an aliphatic carbon. 3. So the compound is an alcohol. _Source: syllabus Chemistry Part II, Class XII, Alcohols, Phenols and Ethers._

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A compound with a hydroxyl group joined directly to a benzene ring is a:

  1. Phosphine
  2. Phenol
  3. Phthalate
  4. Phosphate
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Correct answer: B. Phenol

1. The hydroxyl group is on an aromatic ring. 2. That arrangement has its own family name. 3. The compound is a phenol. _Source: syllabus Chemistry Part II, Class XII, Alcohols, Phenols and Ethers._

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Dimethyl ether shows the family in which oxygen links two carbon groups. It is an:

  1. Ether
  2. Ester
  3. Epoxide
  4. Ethanal
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Correct answer: A. Ether

1. Oxygen sits between two alkyl or aryl groups. 2. No hydroxyl hydrogen remains. 3. So the compound is an ether. _Source: syllabus Chemistry Part II, Class XII, Alcohols, Phenols and Ethers._

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