An organic compound (X) with molecular formula `C_(9)H_(10)O` gives positive 2, 4-DNP and Tollens'tests. It undergoes Cannizzaro reaction and on vigorous oxidation it gives 1, 4-benzenedicarboxylic acid. Compound (X) is

Explanation

i. D.U. in `A=((2n_(C)+2)-n_(H))/(2)=((2xx9+2)-10)/(2)=5^(@)`
5 D.U. in (A) suggests benzene ring (4 D.U.) and (CHO) group (1 D.U.).
ii. Total C atoms in (A) = 9.
iii. Formation of (B) suggests that two C atoms `(CH_(3)CH_(2)`-group) are present in ortho-position to (CHO) group.
Reaction: