The smallest ketone and its next homologue are reacted with $NH_2OH$ to form oximes.

In the following reactions,$P, Q, R$,and $S$ are the major products.
The correct statement$(s)$ about $P, Q, R$,and $S$ is(are):
$(A)$ Both $P$ and $Q$ have asymmetric carbon$(s)$.
$(B)$ Both $Q$ and $R$ have asymmetric carbon$(s)$.
$(C)$ Both $P$ and $R$ have asymmetric carbon$(s)$.
$(D)$ $P$ has asymmetric carbon$(s)$,$S$ does not have any asymmetric carbon.

Which of the following compounds gives only a primary alcohol on reaction with a Grignard reagent $(RMgX)$?

What is $A$ in the following reaction?

Which of the following compounds can undergo both Cannizzaro reaction and Aldol condensation?

Clemmensen reduction involves the conversion of $ >C=O $ to $ >CH_2 $ in the presence of: