Consider the following reaction:

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(B) The reaction shown is a Friedel-Crafts acylation of anisole $(methoxybenzene)$ in the presence of nitrobenzene. Nitrobenzene is a strongly deactiv

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(B) The reaction shown is a Friedel-Crafts acylation of anisole $(methoxybenzene)$ in the presence of nitrobenzene. Nitrobenzene is a strongly deactivating solvent and does not participate in the reaction. Anisole contains an $-OCH_3$ group,which is an ortho/para directing group. Therefore,the electrophilic substitution (acylation) will occur at the ortho and para positions of the anisole ring,yielding a mixture of $2$-methoxyacetophenone and $4$-methoxyacetophenone.

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