Which among the following is the strongest base?

$A$ 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

Identify the strongest base from the following.

What are $X$ and $Y$ in the following reactions?

The order of basic strength of methyl substituted amines and $NH_3$ in aqueous solution is

Which of the following amines, when heated with ethanolic $KOH$ and chloroform $(CHCl_3)$, does $NOT$ produce a foul smell?