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(B) $1$. The reaction of benzene with phthalic anhydride in the presence of $AlCl_3$ (Friedel-Crafts acylation) gives $o$-benzoylbenzoic acid as produ

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Anthrone

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(B) $1$. The reaction of benzene with phthalic anhydride in the presence of $AlCl_3$ (Friedel-Crafts acylation) gives $o$-benzoylbenzoic acid as product $(A)$.$2$. Reduction of $(A)$ with $Zn-Hg/HCl$ (Clemmensen reduction) reduces the carbonyl group of the ketone to a methylene group,yielding $o$-benzylbenzoic acid as product $(B)$.$3$. Treatment of $(B)$ with $SOCl_2$ converts the $-COOH$ group to $-COCl$. Subsequent intramolecular Friedel-Crafts acylation in the presence of $AlCl_3$ followed by hydrolysis yields anthrone as the final product $(C)$.

The end product $(C)$ is

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