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Answer the following. (Class 12 Chemistry 2024, Q19b)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/5/1 · 2 marks · Very short answer

CBSE Class 12 Chemistry 2024: question 19(b)

Set in the CBSE Class 12 board exam of 2024, paper 56/5/1, section B, question 19(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q19(b) · 2 marks · Very short answerAmines

Answer the following.

  1. (i)

    Write a chemical test to distinguish between Dimethyl amine and Ethanamine.

    1 mark
  2. (ii)

    Write the product formed when benzene diazonium chloride is treated with KI.

    1 mark

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 56/5/1.

Hints

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

Hint 1

One amine is primary and the other secondary; which test works only for 1° amines?

Hint 2

The diazonium group is a good leaving group and is replaced directly by iodide.

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. (i) Carbylamine test: Warm each amine with chloroform and alcoholic KOH. Ethanamine, a primary amine, gives the foul-smelling ethyl isocyanide; dimethylamine, a secondary amine, gives no such smell.

    1 mark

  2. (ii) Iodobenzene is formed:

    1 mark

Answer: (i) Carbylamine test – ethanamine gives foul-smelling isocyanide, dimethylamine does not; (ii) Iodobenzene ()

Where the marks are

  • Correct distinguishing test with observation (1 mark)
  • Iodobenzene as product (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Amines, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 56/5/1: 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.