From the following reactions,identify the reactions that give carboxylic acids as products.

Compound $A$ was prepared by oxidation of compound $B$ with alkaline $KMnO_4$. Compound $A$ on reduction with lithium aluminium hydride $(LiAlH_4)$ gets converted back to compound $B$. When compound $A$ is heated with compound $B$ in the presence of $H_2SO_4$,it produces a fruity smell of compound $C$. To which family do the compounds $A$,$B$,and $C$ belong?

What will be $X$ and $Y$ in the following reactions?

The reaction of sodium acetate with acetyl chloride proceeds through which of the following mechanisms?

Which of the following reactions give $RCONH_2$?

In the given reaction,$[X]$ will be: