Grignard reagent adds to

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Question

(D) Grignard reagents $(RMgX)$ are nucleophilic and readily undergo addition reactions with polar multiple bonds such as $C = O$,$-C \equiv N$,and $C

Vedclass · Accepted Answer

All of the above

Vedclass · Answer

(D) Grignard reagents $(RMgX)$ are nucleophilic and readily undergo addition reactions with polar multiple bonds such as $C = O$,$-C \equiv N$,and $C = S$ groups.$1$. Reaction with $C = O$: $RMgX + >C = O$ $\rightarrow >C(R)-OMgX$ $\xrightarrow{H_2O} >C(R)-OH + Mg(OH)X$$2$. Reaction with $-C \equiv N$: $RMgX + -C \equiv N$ $\rightarrow -C(R) = NMgX$ $\xrightarrow{H_2O} -C(R) = O + NH_3 + Mg(OH)X$$3$. Reaction with $C = S$: $RMgX + >C = S$ $\rightarrow >C(R)-SMgX$ $\xrightarrow{H_2O} >C(R)-SH + Mg(OH)X$Since Grignard reagents react with all these groups,the correct option is $(D)$.

Column $I$	Column $II$
$A$. $C_6H_5CHO$	$p$. gives precipitate with $2, 4-$dinitrophenylhydrazine
$B$. $CH_3C \equiv CH$	$q$. gives precipitate with $AgNO_3$
$C$. $CN^{-}$	$r$. is a nucleophile
$D$. $I^{-}$	$s$. is involved in cyanohydrin formation

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