$$\begin{gathered} \mathrm{C}{\mathrm{H}}_4\underset{\mathrm{Cu}/523 \mathrm{K},\text{\hspace{0.17em}\hspace{0.17em}100 atm}}{\overset{{\mathrm{O}}_2}{\to }}\mathrm{A}; \\ {\mathrm{CH}}_4\underset{{\mathrm{Mo}}_2{\mathrm{O}}_3;∆}{\overset{{\mathrm{O}}_2}{\to }}\text{ B; } \\ {\mathrm{CH}}_3{\mathrm{CH}}_3\underset{{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2\mathrm{Mn}}{\overset{{\mathrm{O}}_2}{\to }}\mathrm{C}; \end{gathered}$$

A, B, C respectively are

Aldehyde, Alcohol, Carboxylic acid

Alcohol, Aldehyde, Carboxylic acid

Aldehyde, Aromatic Hydrocarbon, Alcohol.

Alcohol, Carboxylic acid, Aldehyde