Which of the following on reaction with ammoniacal silver nitrate forms silver precipitate?

Identify the product 'B' in following reaction.

Ethyl phenyl ketone $$\mathrm{\buildrel {{H_2}N - N{H_2}} \over \longrightarrow}$$ A $$\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow} \limits_\Delta ^{KOH,HO - {{(C{H_2})}_2} - OH}}}$$

What type of reaction is the formation of aldol from aldehyde?

Which of the following reagents is used in the reaction shown below?

Benzoyl chloride $$\stackrel{?}{\longrightarrow}$$ Benzaldehyde