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1‑Bromobutane is treated with excess sodium amide () in liquid ammonia. What is the major organic product obtained?

easy MCQ 2 marks Class 12 · Chemistry · Haloalkanes and Haloarenes
  1. Butane
  2. 1‑aminobutane
  3. 1‑bromo‑2‑bromobutane
  4. 1,4‑dibromobutane
Answer
1‑aminobutane

The correct answer is 1‑aminobutane — Conclude that the major organic product is 1‑aminobutane.

Step-by-step solution

  1. Identify that is a strong, hard nucleophile.
  2. Recognise that is a primary alkyl halide, suitable for SN2 substitution.
  3. Predict that the SN2 reaction will replace the bromine atom by the amide anion, forming .
  4. Conclude that the major organic product is 1‑aminobutane.
Common mistake: Confusing the nucleophile with the leaving group or forgetting the SN2 mechanism for primary halides

Concept tested: SN2 substitution of primary alkyl halide

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