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?

What is the product formed when cumene is air oxidised in presence of Co-naphthenate and further treated with dilute acid?