what is the action of the following reagent on prepanone? a) Phenyl hydrazine b) Zn-Hg/ conc.Hcl c) Sodium bisulphite
Answers
Answer:
a) Aldehydes react with sodium bisuphite through a nucleophilic addition reaction and forms a white crystalline solid bisulphite addition compound
With Grignard reagent
Again its a nucleophilic addition reaction.
With Phenyl hydrazine
Aldehydes undergoes condensation reaction.
NH2– Z is an example of nucleophilic addition elemination reaction where – Z groups are following in nature. First attack from nucleophilic site of nitrogen atom to electrophilic carbon atom then elimination of water occurs simultaneously.
These reactions are usually carried out in weakly acidic medium because weak acid catalyses the reaction by protonating carbonyl oxygen but in presence of excess of acid nucleophile is also protonated which reduces its reactivity, so optimum pH is necessary.
Explanation:
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