Q.
In the following reaction sequence, the compound $J$ is an intermediate.
$\ce{I ->[{(CH_3CO)_2O}][{CH_3COONa}] J}\ce{ ->[{(i)H_2Pd/C}][{(ii)SOCl_2(iii)anhyd.AlCl_3}] K}$
$J \left( C _{9} H _{8} O _{2}\right)$ gives effervescence on treatment with $NaHCO _{3}$ and a positive Baeyer's test
The compound I is
AIEEEAIEEE 2012
Solution: