$$\begin{gathered} {\mathrm{CH}}_3\mathrm{COOH}\stackrel{\mathrm{A}}{\to }{\mathrm{CH}}_3\mathrm{COCl}\stackrel{\mathrm{B}}{\to }\mathrm{X} \\ \stackrel{\mathrm{Y}}{\to }\mathrm{C}\underset{2.{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{1.\mathrm{NaOH},∆}{\to }}{\mathrm{CH}}_3\mathrm{CH}\left(\mathrm{OH}\right)\mathrm{COOH} \end{gathered}$$

Correct match is 

A = SOCl₂ : C = CH₃CHO

A = Pd,BaSO₄,Sulphur ; C = SOCl₂ 

B = Pd,BaSO₄,Sulphur ; Y = HCN

B = Pd,BaSO₄,Sulphur ; X = CH₃CH(OH)CN