In a given reaction sequence

${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{N}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\stackrel{\left(\mathrm{i}\right) {\mathrm{CH}}_3\mathrm{MgBr}}{⟶}}\mathrm{A}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right) {\mathrm{Br}}_2/\mathrm{NaOH}}{\to }}\mathrm{B}\stackrel{red \mathrm{P}+{\mathrm{Br}}_2}{\to }\mathrm{C}$

Number of lone pair in end product $\left(\mathrm{C}\right)$ is $\mathrm{x}$ then the value of $2\mathrm{x}$ will be

1. Aliphatic amines preparations and properties:

2. Aniline preparations and properties:

3. Diazonium salt Preparations:

4. Chemical Properties of Diazonium salt:

(i) Nucleophilic substitution reactions:

(ii) Coupling reactions:

(iii) Formation of Methyl Orange: