Cannizzaro reaction between formaldehyde molecules involves the formation of

Explain the different oxidation reactions of aldehydes and ketones.

Which one of the following compounds will give an orange precipitate when treated with $2,4-$dinitrophenylhydrazine?

Which of the following does not give a yellow precipitate with $I_2$ and $NaOH$?

The compound $A$,$C_{8}H_{8}O_{2}$,reacts with acetophenone to form a single product via cross-Aldol condensation. The compound $A$ on reaction with conc. $NaOH$ forms a substituted benzyl alcohol. Identify compound $A$.

An organic compound contains $69.77 \%$ carbon,$11.63 \%$ hydrogen and the rest is oxygen. The molecular mass of the compound is $86$. It does not reduce Tollens' reagent but forms an addition compound with sodium hydrogensulphite and gives a positive iodoform test. On vigorous oxidation,it gives ethanoic acid and propanoic acid. Write the possible structure of the compound.