In the following reaction sequence, the compound J is an intermediate. I underset(CH_(3)COONa)overset((CH_(3)CO)_(2)O)toJ underset((ii)." "SOCl_(2),(iii)." anhyd. "AlCl_(3))overset((i)." "H_(2),Pd//C)toK J(C_(9)H_(8)O_(2)) gives effervescence on treatment with NaHCO_(3) and a positive Baeyer's test. Q. The compound I is

In the following reaction sequence, the compound J is an intermediate.

1.	In the following reaction sequence, the compound J is an intermediate. I underset(CH_(3)COONa)overset((CH_(3)CO)_(2)O)toJ underset((ii)." "SOCl_(2),(iii)." anhyd. "AlCl_(3))overset((i)." "H_(2),Pd//C)toK J(C_(9)H_(8)O_(2)) gives effervescence on treatment with NaHCO_(3) and a positive Baeyer's test. Q. The compound I is
Answer» Solution :Since COMPOUND, J (M.F. `C_(9)H_(8)O_(2)`) gives effervescence with `NaHCO_(3)` and a positive test with BAEYER's reagent, therefore, (J) is an unsaturated acid. Since (J) is obtained by treatment of compound (I) with `(CH_(3)CO)_(2)O` in presence of `CH_(3)COONa`, therefore, compound (I) must be benzaldehyde which UNDERGOES Perkin reaction with `(CH_(3)CO)_(2)O` in presence of `CH_(3)COONa` to FORM cinnamic acid (J) which is an `alpha,beta`-unsaturated acid. thus