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JEE Main levelSingle correct optionDifficulty 2 of 3o1127

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

  1. A2,2,4,4-tetramethylpentan-3-one
  2. Bacetaldehyde
  3. Cpentan-2-one
  4. Dcyclopentanone

Answer: A

Acetaldehyde (aldehyde), pentan-2-one (methyl ketone) and cyclopentanone (unhindered cyclic ketone) all add the bisulphite ion. In 2,2,4,4-tetramethylpentan-3-one two tert-butyl groups block the approach to the carbonyl carbon, so no adduct forms.
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