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The organic compounds… (Class 12 Chemistry SQP 2025-26, Q4)

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ChemistryCBSE Class 12 · Sample paper, session 2025-26 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2025-26: question 4

From the official CBSE sample question paper for 2025-26, section A, question 4, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q4 · 1 mark · MCQAmines

The organic compounds A, B and C are amines having equivalent molecular weight. A and B on reaction with benzene sulphonyl chloride give white precipitate, however white precipitate obtained from compound B remains insoluble in NaOH.
The variation in the boiling point of A, B and C can be seen as :

  1. (A)A> B>C
  2. (B)B>A>C
  3. (C)A=B > C
  4. (D)C>B>A

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

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

Hint 1

Use the Hinsberg test to classify each amine.

Hint 2

Count the N–H bonds available for hydrogen bonding.

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. Hinsberg test: A's product dissolves in NaOH, so A is a 1° amine. B's product is insoluble, so B is a 2° amine. C does not react, so C is a 3° amine.

  2. Hydrogen bonding falls as the number of N–H bonds falls (1° > 2° > 3°), so the boiling points are A > B > C.

    1 mark

Answer: A > B > C, option (A)

Where the marks are

  • Classifies amines and relates H-bonding to b.p. (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 2025-26: 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.