Compound (A), C8H9Br gives a yellow precipitate when warmed with alcoholic AgNO3. Oxidation o f (A) gives an acid (B), C8H6O4 . (B) easily forms anhydride on heating. Identify the compound (A).

Question

Compound (A), C8H9Br gives a yellow precipitate when warmed with alcoholic AgNO3. Oxidation o f (A) gives an acid (B), C8H6O4 . (B) easily forms anhydride on heating. Identify the compound (A). (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Compound A gives a precipitate with alcoholic

A g N O_{3}

, so it must contains Br in side chain. On oxidation, it gives

C_{8} H_{6} O_{4}

, which shows the presence of two alkyl chains attached directly with the benzene nucleus. Since compound B gives anhydride on heating, the two alkyl substituent must occupy adjacent (1,2) position. Thus, A must be

and the reactions are as follows

Q. Compound (A), C8​H9​Br gives a yellow precipitate when warmed with alcoholic AgNO3​. Oxidation o f (A) gives an acid (B), C8​H6​O4​ . (B) easily forms anhydride on heating. Identify the compound (A).

Q. Compound (A), $C_{8} H_{9} B r$ gives a yellow precipitate when warmed with alcoholic $A g N O_{3}$ . Oxidation o f (A) gives an acid (B), $C_{8} H_{6} O_{4}$ . (B) easily forms anhydride on heating. Identify the compound (A).