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Carry out following… (Class 12 Chemistry SQP 2025-26, Q19)

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ChemistryCBSE Class 12 · Sample paper, session 2025-26 · 2 marks · Very short answer

CBSE Class 12 Chemistry sample paper 2025-26: question 19

From the official CBSE sample question paper for 2025-26, section B, question 19, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q19 · 2 marks · Very short answerAmines

Carry out following conversions :
I. Nitrobenzene to 4- bromobenzenamine
II. Chlorophenylmethane to 2-phenyl-ethanamine

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

For I, first make aniline, then protect –NH₂ so that only one Br enters at the para position.

Hint 2

For II, the product has one more carbon than the starting compound, so which reagent adds a carbon and can be reduced to –CH₂NH₂?

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. Nitrobenzene aniline acetanilide 4-bromoacetanilide 4-bromobenzenamine.

    Acetylation lowers the activating power of –NH, so mainly the mono para-bromo product forms.

    1 mark

  2. II. (2-phenylethanamine).

    1 mark

Answer: I. PhNO₂ → (Sn/HCl) PhNH₂ → (Ac₂O) PhNHCOCH₃ → (Br₂) p-BrC₆H₄NHCOCH₃ → (hydrolysis) p-BrC₆H₄NH₂. II. PhCH₂Cl → (KCN) PhCH₂CN → (LiAlH₄) PhCH₂CH₂NH₂.

Where the marks are

  • Correct sequence: reduction, acetylation, bromination, hydrolysis (1 mark)
  • Cyanide substitution then reduction to 2-phenylethanamine (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.