How many metamers are possible for the molecular formula $C_4H_{11}N$?

Which one of the following is called a carbylamine?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Experimental reaction of $CH_{3}Cl$ with aniline and anhydrous $AlCl_{3}$ does not give $o-$ and $p-$methylaniline.
Reason $(R)$: The $-NH_{2}$ group of aniline becomes deactivating because of salt formation with anhydrous $AlCl_{3}$ and hence yields $m-$methylaniline as the product.
In the light of the above statements,choose the most appropriate answer from the options given below.

$Isopropyl$ amine with an excess of acetyl chloride will give:

How will you carry out the following conversions?
$(i)$ Aniline to $1,3$-dibromo-$5$-nitrobenzene
(ii) Aniline to $1,3$-dibromo-$2$-iodo-$5$-nitrobenzene

Which of the following reactions is an example of ammonolysis?