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MolSynapse / Question bank / Organic Reaction Mechanisms I: Nucleophiles and Carbonyl Addition / Addition of cyanide, bisulphite, Grignard reagents

NEET levelSingle correct optionDifficulty 1 of 3o1116

The carbonyl compound can be regenerated from its bisulphite addition product by

Aadding more saturated $NaHSO X_{3}$ solution
Bwarming with dilute hydrochloric acid
Cshaking with anhydrous ether
Dadding saturated $NaCl$ solution

Answer: B

Addition of

HSO X_{3} X^{-}

is reversible. Dilute acid destroys

HSO X_{3} X^{-}

(as

SO X_{2}

and water), which pulls the equilibrium back to the free aldehyde or ketone. Adding more bisulphite pushes the equilibrium toward the adduct.

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