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Ammonolysis of ethyl… (Class 12 Chemistry SQP 2024-25, Q1)

questionbuddy.in/q/cbse-12-chemistry-2024-25-sqp-q1-ammonolysis-ethyl-chloride-followed-reaction

ChemistryCBSE Class 12 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2024-25: question 1

From the official CBSE sample question paper for 2024-25, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQAmines

Ammonolysis of ethyl chloride followed by reaction of the amine so formed with 1 mole of methyl chloride gives an amine that

  1. (A)reacts with Hinsberg reagent to form a product soluble in an alkali.
  2. (B)on reaction with Nitrous acid, produced nitrogen gas.
  3. (C)reacts with Benzenesulphonyl chloride to form a product that is insoluble in alkali.
  4. (D)does not react with Hinsberg reagent.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

Work out which amine forms after one methyl group is added to ethylamine.

Hint 2

Recall how 1°, 2° and 3° amines behave with Hinsberg reagent.

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. Ammonolysis: (primary amine). With 1 mol : (secondary amine).

  2. A secondary amine reacts with benzenesulphonyl chloride (Hinsberg reagent) to give an N,N-disubstituted sulphonamide. It has no H on N, so it is not acidic and is insoluble in alkali. Option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Identifies the secondary amine and its alkali-insoluble Hinsberg product (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 2024-25: 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.