Reaction of formaldehyde and ammonia gives

In the Cannizzaro reaction,the intermediate that will be the best hydride donor is:

The total number of $sp^2$ hybridised carbon atoms in the major product $P$ (a non-heterocyclic compound) of the following reaction is. . . . . . .

Provide the chemical conversion for the following:
$(i)$ $3-$phenylprop$-2-$enal from Benzaldehyde and Ethanal (Cross-Aldol Condensation).
$(ii)$ Benzyl alcohol from Benzene.

What is the characteristic odor of nitrobenzene?

The reaction of chloroform with acetone gives ...................