When acetamide is treated with $HNO_2,$ the gas evolved is:

What is formed when $1-$propanamine is treated with $NaNO_2$ and $HCl$?

What is the product formed upon hydrolysis of the minor product obtained from the reaction of $1-$bromopropane with ethanolic $KCN$?

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

The amine which does not react with chloroform and ethanolic potassium hydroxide is

Arrange the following compounds in decreasing order of basic strength:
$(i)$ Aniline
(ii) $p$-Nitroaniline
(iii) $p$-Cyanoaniline
(iv) $p$-Toluidine