Which of the following compounds is obtained when cyclohexene is oxidized using $\mathrm{KMnO}_4$ in dilute $\mathrm{H}_2 \mathrm{SO}_4$ ?

Which from following compounds is obtained when acyl chloride is hydrolysed with water?

Which among the following is NOT dicarboxylic acid?

Identify '$$\mathrm{A}$$' in the following reaction.

A+ Acetic anhydride $$\xrightarrow{\mathrm{H}^{+}}$$ Aspirin + Acetic acid