(B) The compound ${C_6}{H_5}COCl$ consists of a benzene ring attached to a carbonyl chloride group. According to $IUPAC$ nomenclature rules,when the $

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(B) The compound ${C_6}{H_5}COCl$ consists of a benzene ring attached to a carbonyl chloride group. According to $IUPAC$ nomenclature rules,when the $-COCl$ group is attached directly to a ring,the suffix used is 'carbonyl chloride'. Therefore,the parent name is benzene and the suffix is carbonyl chloride,resulting in the name 'Benzene carbonyl chloride'.