(A) The given compound is $C_6H_5COCH_3$.In the $IUPAC$ system,ketones are named by replacing the suffix $-e$ of the corresponding alkane with $-one$.

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(A) The given compound is $C_6H_5COCH_3$.In the $IUPAC$ system,ketones are named by replacing the suffix $-e$ of the corresponding alkane with $-one$.The parent chain is the two-carbon chain (ethane),and the phenyl group is attached to the first carbon.Therefore,the $IUPAC$ name is $1-$phenylethanone (commonly known as acetophenone).