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(C) The reaction of benzene with succinic anhydride in the presence of anhydrous $AlCl_3$ is a Friedel-Crafts acylation reaction. This produces $X$,wh

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$4-$oxo$-4-$phenylbutanoic acid and $1-$tetralone

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(C) The reaction of benzene with succinic anhydride in the presence of anhydrous $AlCl_3$ is a Friedel-Crafts acylation reaction. This produces $X$,which is $4$-oxo-$4$-phenylbutanoic acid (also known as $\beta$-benzoylpropionic acid).
In the second step,$X$ undergoes intramolecular cyclization (Friedel-Crafts acylation) in the presence of phosphoric acid $(H_3PO_4)$ and heat $(\Delta)$. This results in the formation of $Y$,which is $1$-tetralone ($3,4$-dihydro-$1(2H)$-naphthalenone).
Therefore,$X$ is $4$-oxo-$4$-phenylbutanoic acid and $Y$ is $1$-tetralone.

In the following reactions,$X$ and $Y$,respectively,are

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