Which of the following amines is most basic in nature in the aqueous phase?

Why is aniline soluble in aqueous $HCl$?

Identify the alkene obtained as the major product in the following Hofmann elimination reaction.
$(CH_3CH_2CH_2)N^{+}(CH_2CH_3)_3 I^{-}$ $\xrightarrow[\Delta]{\text{moist } Ag_2O} A$ $\xrightarrow[\Delta]{\text{heat}} \text{Alkene} + \text{Amine}$

In the following reaction $X$ is
$CH_3NH_2 + X + KOH \to CH_3NC$ (highly offensive odour)

In the reaction $RNH_2 + CHCl_3 + 3KOH(alc.) \rightarrow A + 3KCl + 3H_2O$,the product $A$ can be converted back to $RNH_2$ by which process?

Which one of the following amides will not undergo the Hoffmann bromamide reaction?