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An organic compound… (Class 12 Chemistry SQP 2026-27, Q4)

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

CBSE Class 12 Chemistry sample paper 2026-27: question 4

From the official CBSE sample question paper for 2026-27, section A, question 4, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q4 · 1 mark · MCQAmines

An organic compound “X” on reaction with chloroform and alcoholic KOH gives foul smelling product.

In which of the following case compound X would be produced:

  1. (A)Chloromethane is treated with AgCN.
  2. (B)Nitrobenzene is reduced.
  3. (C)Benzene diazonium chloride is treated with Cu/KCN
  4. (D)Aniline reacts with Acetyl chloride.

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

Name the test that gives a foul-smelling isocyanide.

Hint 2

Decide which option produces a primary amine.

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 foul-smelling product with and alcoholic KOH is an isocyanide (carbylamine test). Only primary amines give this test, so X must be a primary amine.

  2. Reduction of nitrobenzene gives aniline, which is a primary amine. The other options give an isocyanide (A), a nitrile (C) or an amide (D), none of which is a primary amine. So the answer is B.

    1 mark

Answer: Option (B)

Where the marks are

  • Recognises the carbylamine test and identifies aniline from reduction of nitrobenzene (1 mark)

Revise the chapter

  • Chapter: Amines (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Amines, 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.