Compound (A), ${\text{C}}_8{\text{H}}_9\text{Br}$, gives a white precipitate when warmed with alcoholic ${\text{AgNO}}_3$. Oxidation of (A) gives an acid (B), ${\text{C}}_8{\text{H}}_6{\text{O}}_4$. (B) easily forms anhydride on heating. Identify the compound (A).

1. A
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2. B
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3. C
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4. D
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