In the given reaction $A$ is :- $A$ $\xrightarrow{\text{Reduction}} B$ $\xrightarrow{HNO_2} C_2H_5OH$

In which of the following,reagent and product are correctly matched with respect to benzene diazonium chloride as reactant?

The compound which gives an oily nitrosoamine on reaction with nitrous acid at low temperature is:

In the following reaction,the major product $(P)$ formed is

The product$(s)$ of the following reaction sequence is(are):
Aniline $\xrightarrow[\text{ii) } KBrO_3/HBr]{\text{i) Acetic anhydride/pyridine}}$ $\xrightarrow[\text{iv) } NaNO_2/HCl, 273-278 \ K]{\text{iii) } H_3O^+, \text{heat}}$ $\xrightarrow{\text{v) } Cu/HBr} \text{Product}$

$CH_3-CH_2-CH(CH_3)-CONH_2$ $\xrightarrow[ \Delta ]{ Br_2/KOH } (A)$ $\xrightarrow[ (2) AgOH/\Delta ]{ (1) CH_3I (excess) } (B)$. The major product $(B)$ is: