(B) The given compound is $CH_3C \equiv N$. In $IUPAC$ nomenclature,nitriles are named by adding the suffix 'nitrile' to the name of the corresponding

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(B) The given compound is $CH_3C \equiv N$. In $IUPAC$ nomenclature,nitriles are named by adding the suffix 'nitrile' to the name of the corresponding alkane (including the carbon atom of the cyano group). The chain contains two carbon atoms ($CH_3$ and $CN$),so the parent alkane is ethane. Therefore,the $IUPAC$ name is ethanenitrile.