Which statement about naming a nitrile as the only principal functional group is correct?
AThe carbon of the $-CN$ group is not counted in the parent chain
BThe nitrogen of the $-CN$ group is counted as carbon 1
CThe carbon of the $-CN$ group is carbon 1 in numbering
DNitrile must always be named as a prefix, never as a suffix
Answer & Solution
Correct answer: C. The carbon of the $-CN$ group is carbon 1 in numbering
For a nitrile when it is the principal functional group, the carbon of the $-CN$ group is included in the parent chain and is assigned carbon 1. The nitrogen is not part of the carbon chain, and nitrile can be used as a suffix when it has principal-group priority.
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