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

Identify the reagent used in the following reaction.

Benzoic acid $$\xrightarrow[\Delta]{\text { Reagent }}$$ Benzoyl chloride + Phosphorous oxychloride + Hydrogen chloride