The major product obtained in the reaction of $1,3$-Butadiene with $\mathrm{HCl}$ ($1$ mole) at a higher temperature ($100°\mathrm{C}$ or above) is

The order of stability of the alkenes 

$\begin{array}{c}{\mathrm{R}}_2\mathrm{C}={\mathrm{CR}}_2\\ \mathrm{I}\end{array}$, $\begin{array}{c}{\mathrm{R}}_2\mathrm{C}=\mathrm{CHR}\\ \mathrm{II}\end{array}$, $\begin{array}{c}{\mathrm{R}}_2\mathrm{C}={\mathrm{CH}}_2\\ \mathrm{III}\end{array}$, $\begin{array}{c}\mathrm{RCH}=\mathrm{CHR}\\ \mathrm{IV}\end{array}$ and $\begin{array}{c}\mathrm{RCH}={\mathrm{CH}}_2\\ \mathrm{V}\end{array}$

is-

Which of the following order is correct for the decreasing reactivity to ring monobromination of the following compounds:

Electrophile $\stackrel{\oplus }{\mathrm{N}}{\mathrm{O}}_2$ attacks the following :

in which cases $\stackrel{\oplus }{\mathrm{N}}{\mathrm{O}}_2$ will attack at meta position.