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Assertion (A)… (Class 12 Chemistry SQP 2026-27, Q15)

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ChemistryCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry sample paper 2026-27: question 15

From the official CBSE sample question paper for 2026-27, section A, question 15, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q15 · 1 mark · Assertion-reasonCompetency-basedAlcohols, Phenols and Ethers

Assertion (A): Miscibility of ethers with water resembles those of alcohols of the same molecular mass.
Reason (R): The oxygen of ether can also form hydrogen bonds with water.

Select the most appropriate answer from the options given below:

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

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Compare diethyl ether with butanol.

Hint 2

Ask whether the ether oxygen can take part in hydrogen bonding with water.

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. A is true: lower ethers such as diethyl ether are about as miscible with water as butan-1-ol, an alcohol of the same molecular mass.

  2. R is true: the ether oxygen accepts hydrogen bonds from water molecules, and this is exactly why ethers mix with water. So R correctly explains A.

    1 mark

Answer: Option (A)

Where the marks are

  • Both true; H-bonding of the ether oxygen with water explains the miscibility (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 paperSample paper 2026-27: 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.