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Assertion (A) : A mixture… (Class 12 Chemistry 2025, Q13)

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ChemistryCBSE Class 12 · Board exam 2025, set 56/7/1 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry 2025: question 13

Set in the CBSE Class 12 board exam of 2025, paper 56/7/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedAlcohols, Phenols and Ethers

Assertion (A) : A mixture of o-nitrophenol and p-nitrophenol can be separated by steam distillation.
Reason (R) : o-nitrophenol is steam volatile due to intermolecular hydrogen bonding.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 56/7/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Think about where the –OH and –NO2 groups are in the ortho isomer.

Hint 2

Is the H-bond within one molecule or between molecules?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. The assertion is true: the isomers are separated by steam distillation.

  2. The reason is false: o-nitrophenol is steam volatile because of intramolecular H-bonding, while p-nitrophenol is less volatile because of intermolecular H-bonding (association).

    1 mark

Answer: (C)

Where the marks are

  • A true; R false because the H-bonding is intramolecular (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Alcohols, Phenols and Ethers, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 56/7/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.