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Hydrogenof acetadehydeare nothighlyacidicmediumexplain . |
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Answer» Solution :In weakly ACIDIC MEDIUM, the carbonyl group is protonated. As a result of PRESENCE of +ve charge on carbon, the protonated carbonyl group UNDERGOES nucleophilic attack of hydrazine easily `[-underset(| )C= O +H^+ hArr - underset(| ) C=overset(+)OH harr- underset(|) C^(+)- underset(* *) overset(**) H]` In strongly acidic medium, the hydrazine being basic in nature, forms its salt by protonating the unshared pair of electrons on N atom. `H_2overset(* *) n overset(**)NH_2 overset(H^+ ) hArrH_3^(-) N NH_2` This salt cannot act as nucleophile. Thus, to CARRY out these reactions, we have to control the pH between 3 and 4. |
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