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Which of the following does NOT form a crystalline bisulphite addition product with saturated aqueous ?

  1. Aacetaldehyde
  2. Bcyclohexanone
  3. Cacetophenone,
  4. Dacetone

Answer: C

Aldehydes, methyl ketones and unhindered cyclic ketones add bisulphite. Acetophenone is conjugated with the ring and hindered by the phenyl group, so it does not give an appreciable adduct.
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