Question:

Given below are two statements :

Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.

Statement II : The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.

In the light of the above statements, choose the most appropriate answer from the options given below :

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NaHSO\(_3\) adds to give a zwitterion (proton transfer); HCN addition gives a cyanohydrin, not an amine.
Updated On: Nov 4, 2026
  • Both Statement I and Statement are true.
  • Statement I is true but Statement II is false.
  • Statement I is false but Statement II is true.
  • Both Statement I and Statement II are false.
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The Correct Option is B

Solution and Explanation

Statement I: HSO\(_3^-\) attacks the carbonyl carbon through S; the alkoxide formed takes a proton from the \(\mathrm{SO_3H}\) group to give a stable zwitterion (\(\mathrm{R_2C(OH)SO_3^-Na^+}\)). So Statement I is true.
Statement II: HCN adds to aldehydes/ketones to give cyanohydrins, \(\mathrm{R_2C(OH)CN}\), not amines. So Statement II is false.
Answer: (2) Statement I is true but Statement II is false.
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