Benzene diazonium chloride on reaction with ethanol forms

$A$ 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

Consider the following sequence of reactions. The percentage of nitrogen in the yellow product $(X)$ formed is . . . . . . %. (Nearest Integer) (Given Molar mass in g mol$^{-1}$ $H$:$1$, $C$:$12$, $N$:$14$)

The descending order of basicity of the following amines is $:$
$(A)$ Aniline
$(B)$ $p$-Methoxyaniline
$(C)$ $p$-Nitroaniline
$(D)$ Methylamine
$(E)$ Dimethylamine
Choose the correct answer from the options given below $:$

The major product obtained in the following reaction is:

Arrange the following in the order of decreasing basicity:

$I. RN=CHR^1$

$II. RC \equiv N$

$III. RNH_2$