Which of the following compounds does not give the iodoform test?

What are $X$ and $Y$ respectively in the following reaction sequence?

Identify the condensation product of the following reaction.
$R-CHO + NH_2OH \longrightarrow ?$

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.

The major product in the following reaction sequence is

Identify the suitable reagent for the following conversion: