The dehydrogenation of n-Hexane in the presence of a catalyst gives_____

In the reaction

$2{\mathrm{CH}}_{\mathrm{3}}\mathrm{Br}+\mathrm{Na}\stackrel{\mathrm{ether}}{\to }\mathrm{A} \underset{{\mathrm{HNO}}_{\mathrm{3}}}{\overset{\mathrm{conc}.}{\to }}\mathrm{B};$ $\mathrm{A} \text{and} \mathrm{B}$are _____ respectively.

${\mathrm{C}}_{\mathrm{2}}{\mathrm{H}}_{\mathrm{5}}\mathrm{I} + 2[\mathrm{H}] \stackrel{\mathrm{Zn}-\mathrm{Cu}/\mathrm{alcohol}}{\to }\mathrm{X}+\mathrm{HI}$.

The product $\mathrm{X}$ is______.

Which of the following are the staggered forms of ethane?

(i) 

(ii) 

(iii) 

(iv) 

IUPAC name of the following compound is _____