Rate of electrophilic addition on isobutylene is significantly higher than cis or trans$-2-$butene chiefly due to-
(A)
(B)
(C)
(D)

The reaction most likely occurs by which of the following mechanism ?

The product $\mathrm{P}$ is

The product is :

The product is :

$(1\mathrm{R},3\mathrm{S})-\mathrm{Cis}-1-\mathrm{Bromo}-3-\mathrm{methylcyclohexane}$

The product formed in the reaction is

The increasing order of reactivity of the following isomeric halides with ${\mathrm{AgNO}}_3$ (${\mathrm{H}}_2\mathrm{O}+$ Alcohol) is :

$\left(\mathrm{I}\right) {\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Cl}$

The rates ${\mathrm{r}}_1,{\mathrm{r}}_2$ and ${\mathrm{r}}_3$ are in the order :