NEET Chemistry Nucleophilic Addition MCQ Question
Which of the following statements about nucleophilic addition reactions of aldehydes and ketones is correct?
Nucleophiles attack the carbonyl carbon from a direction perpendicular to the plane of sp² hybridised orbitals.
The addition of hydrogen cyanide to aldehydes occurs at a rapid rate without the need for a base catalyst.
The intermediate formed during nucleophilic addition remains as a carbonyl compound and does not change hybridization.
Sodium hydrogensulphite addition products are stable and do not revert back to the original aldehyde or ketone.
Correct Answer
Detailed Explanation
Statement A is correct as it describes the mechanism of nucleophilic addition where the nucleophile attacks the electrophilic carbon of the carbonyl group. Statement B is incorrect as the reaction requires a base to catalyze the slow addition of HCN. Statement C is incorrect because the hybridization changes from sp² to sp³ during the formation of the tetrahedral intermediate. Statement D is incorrect since sodium hydrogensulphite addition products can revert back to the original carbonyl compounds.
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