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# In the below reaction only $CN^-$ ions are effective because

In the above reaction only $CN^-$ ions are effective because

$\begin{array}{1 1}(a)\;\text{Cyanide is a good nucleophile}\\(b)\;\text{Cyanide is an excellent electrophilic reagent}\\(c)\;\text{Cyanide is strong base}\\(d)\;\text{Cyanide is poisons the base catalyst to force bentaldehyde to take a different course than cyanohydrin}\end{array}$

$CN^-$ good nucleophile.
Hence (a) is the correct option.