The product of the following reaction is:

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(B) The given reaction is a Sandmeyer reaction where a diazonium salt reacts with $CuCN$ to replace the diazonium group $(-N_2^+)$ with a cyano group

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p-tolunitrile

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(B) The given reaction is a Sandmeyer reaction where a diazonium salt reacts with $CuCN$ to replace the diazonium group $(-N_2^+)$ with a cyano group $(-CN)$.In this case,the starting material is $p$-methylbenzenediazonium ion.When it reacts with $CuCN$,the $-N_2^+$ group is replaced by $-CN$,resulting in $p$-tolunitrile ($4$-methylbenzonitrile).

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