Which one of the following products will be formed when benzene reacts with a mixture of concentrated ${\mathrm{HNO}}_3$ and concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ at $60°\mathrm{C}?$

The CORRECT structure of the product $\text{'}\mathrm{A}\text{'}$ formed in the reaction:

 is _______.

$\mathrm{lUPAC}$ name of the following compound is______

${\mathrm{H}}_{\mathrm{3}}\mathrm{C}-\underset{{\mathrm{CH}}_{\mathrm{3}}}{\overset{{\mathrm{CH}}_{\mathrm{3}}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}-{\mathrm{CH}}_{\mathrm{3}}$

In the reaction,

${\mathrm{CH}}_{\mathrm{3}}-{\mathrm{CH}}_{\mathrm{2}}-\mathrm{Br}+2\mathrm{Na}+\mathrm{Br}-{\mathrm{CH}}_{\mathrm{2}}-{\mathrm{CH}}_{\mathrm{3}}\mathrm{ }\underset{∆}{\overset{\mathrm{dry} \mathrm{ether}}{\to }} \mathrm{A}+\mathrm{B}$

A and B are _____ respectively.