Among the following compounds which one will react with acetone to give a product that contains carbon-nitrogen double bond?

Consider following intramolecular aldol condensation reaction.

.

$\mathrm{X}$ can be:

What is the final product $\left(\mathrm{B}\right)$ of this reaction sequence?

Cannizzaro reaction does not take place with:

$\mathrm{PhCHO}+{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}\underset{\left(2\right) \mathrm{hydrolysis}, ∆}{\overset{\left(1\right) {\mathrm{CH}}_3\mathrm{COONa}}{\to }}\mathrm{A}\stackrel{\mathrm{HBr}}{\to }\mathrm{B}$ $\mathrm{B}$

The product $\mathrm{B}$ is:

What will be the product of the following reaction: