The best reagent to carry out the following c | vedclass

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(D) The given reaction involves the reduction of an aldehyde group $(-CHO)$ to a methyl group $(-CH_3)$ while preserving the secondary alcohol group $

Vedclass · Accepted Answer

$(i) N_2H_4; (ii) \mathop O\limits^\Theta H, \Delta$

Vedclass · Answer

(D) The given reaction involves the reduction of an aldehyde group $(-CHO)$ to a methyl group $(-CH_3)$ while preserving the secondary alcohol group $(-CH(OH)CH_3)$.$1$. $Red \ P / I_2$ is a strong reducing agent that would reduce both the aldehyde and the alcohol group to an alkane.$2$. $LiAlH_4$ is a strong reducing agent that would reduce the aldehyde to a primary alcohol $(-CH_2OH)$ and would not reduce it to a methyl group.$3$. $Zn-Hg / HCl$ is the Clemmensen reduction reagent. It is acidic in nature. The secondary alcohol group is sensitive to acid and might undergo dehydration or other side reactions under these conditions.$4$. $(i) N_2H_4; (ii) \mathop O\limits^\Theta H, \Delta$ is the Wolff-Kishner reduction reagent. It is basic in nature. It selectively reduces the aldehyde (or ketone) group to a methyl (or methylene) group without affecting the alcohol group,which is stable under basic conditions.Therefore,the correct reagent is $(i) N_2H_4; (ii) \mathop O\limits^\Theta H, \Delta$.

Column-$I$ (Reactions)	Column-$II$ (Reagents)
$(i)$. Benzophenone $\rightarrow$ Diphenylmethane	$(a)$. $LiAlH_4$
$(ii)$. Benzaldehyde $\rightarrow$ $1-$Phenylethanol	$(b)$. $DIBAL-H$
$(iii)$. Cyclohexanone $\rightarrow$ Cyclohexanol	$(c)$. $Zn(Hg) / \text{Conc. } HCl$
$(iv)$. Phenyl benzoate $\rightarrow$ Benzaldehyde	$(d)$. $CH_3MgBr, H_2O$

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