$CH_3CHO + NH_2OH \to CH_3-CH=N-OH$
Under which condition does the above reaction occur?

Which of the following compounds is the slowest to react with nitrosonium ion $(NO^{+})$?

Identify the major product of the following reaction.

The compound which does not respond to iodoform test is

The reagent$(s)$ which can be used to bring about the following transformation is(are):
$(A)$ $LiAlH_4$ in $(C_2H_5)_2O$
$(B)$ $BH_3$ in $THF$
$(C)$ $NaBH_4$ in $C_2H_5OH$
$(D)$ Raney $Ni / H_2$ in $THF$

The same product $(A)$ is formed in both of the following reactions:
$1. PhMgBr + CH_3-CN \xrightarrow{H_3O^{+}} (A)$
$2. Ph-COOH \xrightarrow{(1) \text{ excess } CH_3Li, (2) H_3O^{+}} (A)$
Identify product $(A)$.