In the following compounds,the decreasing order of basic strength will be:

Nitrosobenzene can be isolated from nitrobenzene under which of the following conditions?

Which of the following will not give the Hoffmann bromamide reaction?

$A$ student has been given a compound $x$ of molecular formula $C_6H_7N$. $x$ is sparingly soluble in water. However, on addition of dilute mineral acid, $x$ becomes soluble in water. $x$ when treated with $CHCl_3$ and $KOH$ (alc.) produces $y$. $y$ has a specific unpleasant smell. On treatment with benzenesulphonyl chloride, $x$ gives a compound $z$ which is soluble in alkali. The number of different $H$ atoms present in $z$ is:

Aniline when treated with conc. $HNO_3$ gives:

Identify the amine having the highest $pK_{b}$ value.