(C) Hydroquinone is a dihydric phenol where two hydroxyl $(-OH)$ groups are attached to the benzene ring at the $1$ and $4$ positions.According to $IU

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(C) Hydroquinone is a dihydric phenol where two hydroxyl $(-OH)$ groups are attached to the benzene ring at the $1$ and $4$ positions.According to $IUPAC$ nomenclature,the parent chain is benzene,and the hydroxyl groups are indicated by the suffix $-diol$ at positions $1$ and $4$.Therefore,the $IUPAC$ name is Benzene-$1,4$-diol.