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(B) The reaction between benzene and maleic anhydride in the presence of $AlCl_3$ is a Friedel-Crafts acylation reaction.In this reaction,the benzene

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$4-$oxo$-4-$phenylbutanoic acid

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(B) The reaction between benzene and maleic anhydride in the presence of $AlCl_3$ is a Friedel-Crafts acylation reaction.In this reaction,the benzene ring attacks the carbonyl carbon of the maleic anhydride.This leads to the opening of the anhydride ring,resulting in the formation of $4-	ext{oxo}-4-	ext{phenylbutanoic acid}$ (also known as $\beta-	ext{benzoylpropionic acid}$).The correct option is $B$.

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