Chemistry - Carbonyl compounds Question with Solution | TestHub

In the following reaction sequence, the compound $\mathrm{J}$ is an intermediate.
$\mathbf{J}\left({\mathrm{C}}_9{\mathrm{H}}_8{\mathrm{O}}_2\right)$ gives effervescence on treatment with ${\mathrm{NaHCO}}_3$ and a positive Baeyer's test. Question:The compound $\mathbf{K}$ is