The compound Aldehyde hydrazone is:
Correct answer: A. A compound formed by the reaction of an aldehyde with hydrazine.
- A. A compound formed by the reaction of an aldehyde with hydrazine.
- B. A compound formed by the reaction of an aldehyde with water.
- C. A compound formed by the reaction of an aldehyde with an amine.
- D. A compound formed by the reaction of an aldehyde with hydrogen cyanide.
Explanation
Aldehyde hydrazones are organic compounds derived from the reaction of aldehydes with hydrazine (NH2-NH2) or its derivatives. This reaction involves the addition of hydrazine across the carbonyl group of the aldehyde, resulting in the formation of a hydrazone with the general structure RH > CH = N-NH2, where RH represents the organic group attached to the carbonyl carbon of the aldehyde.Option A is correct as it accurately describes this reaction and the resulting compound. Option B is incorrect because a reaction with water forms a hydrate. Option C is incorrect because an aldehyde reacting with an amine forms an imine. Option D is incorrect because a reaction with hydrogen cyanide forms a cyanohydrin.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Nucleophilic Addition Reactions
Nucleophilic addition occurs at the polar carbonyl group of aldehydes and ketones, where a nucleophile attacks the electron-deficient carbon atom. Reactions with hydrogen cyanide, sodium bisulfite, alcohols and Grignard reagents are explained through tetrahedral intermediates, acid or base catalysis, and the different reactivity of aldehydes and ketones.
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