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NTA Abhyas JEE Main2020ChemistryAldehydes and KetonesPractice

Which of the following is nucleophilic addition reaction?

Options

  1. AHydrolysis of ethyl chloride by NaOH
  2. BPurification of acetaldehyde by NaHSO 3
  3. CAlkylation of anisole
  4. DDecarboxylation of acetic acid

Correct answer

B. Purification of acetaldehyde by NaHSO 3

Step-by-step solution

Sodium hydrogen sulphite adds to aldehydes and ketones to form crystalline bisulphite addition products. The product is water soluble and can be converted back to the original carbonyl compound by treating it with dilute mineral acid or alkali. Therefore, these are useful for separation and purification of aldehydes like acetaldehydes.

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