The reaction of aniline with chloroform under alkaline conditions leads to the formation of

The reaction of aniline with a mixture of concentrated $HNO_3$ and $H_2SO_4$ yields ......

$A$ mixture containing the following four compounds is extracted with $1 \, M \, HCl$. The compound that goes to the aqueous layer is:
$(I)$ Cyclohexyl methyl sulfide
$(II)$ $N$-methylcyclohexylamine
$(III)$ Methoxycyclohexane
$(IV)$ Cyclohexyl methyl ketone

$C_6H_5NH_2 \xrightarrow{Br_2/CCl_4} ?$
What is the product?

Consider the following sequence of reactions: $C_2H_5-Br$ $\xrightarrow{AgCN} A$ $\xrightarrow{H_2/Ni} B$. Product $B$ is:

Which gas will be evolved out when $[CH_3CH_2NH_2 + (CH_3)_2CHNH_2]$ is treated with sodium nitrite and $HCl$?