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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Aldehydes and Ketones

NTA Abhyas 2020 · Chemistry · Aldehydes and Ketones

Which of the following is nucleophilic addition reaction?

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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