Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

$A$ compound $X$ with formula $C_4H_{11}N$ reacts with $HNO_2$ to liberate nitrogen and produce compound $Y$. The compound $Y$ on treatment with $I_2 / NaOH$ produces a sodium salt of a carboxylic acid. The compound $X$ is

Identify the major product obtained when ethyl amine $(CH_3CH_2NH_2)$ is reacted with an excess of methyl iodide $(CH_3I)$?

Which of the following is an example of a symmetrical tertiary amine?

$CH_{3}CH_{2}Br$ $\xrightarrow[\Delta]{aq. KOH} A$ $\xrightarrow[\Delta]{KMnO_{4} / H^{+}} B$ $\xrightarrow[\Delta]{NH_{3}} C$ $\xrightarrow[alkali]{Br_{2}} D$. '$D$' is

Arrange the following amines in the order of increasing basicity.