Compound (A),\[{{C}_{8}}{{H}_{9}}Br,\]gives a white precipitate when warmed with alcoholic \[AgN{{O}_{3}}.\] Oxidation of (A) gives an acid (B) , \[{{C}_{8}}{{H}_{6}}{{O}_{4}}.\](B) easily forms anhydride on heating. Identify the compound (A) .
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