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(B) The substrate contains a carbonyl group and a quaternary ammonium group $(-CH_2CH_2N^+(CH_3)_3)$.Wolff-Kishner reduction uses strong basic conditi

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Clemmensen reduction.

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(B) The substrate contains a carbonyl group and a quaternary ammonium group $(-CH_2CH_2N^+(CH_3)_3)$.Wolff-Kishner reduction uses strong basic conditions $(NH_2NH_2, OH^-, \Delta)$,which would cause a Hofmann elimination of the quaternary ammonium group.Clemmensen reduction uses acidic conditions $(Zn(Hg), HCl, \Delta)$,which do not affect the quaternary ammonium group,allowing the selective reduction of the carbonyl group to a methylene group.

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