Amongst the following,the major product of the given chemical reaction is $.....$ .

$CH_2=CHCl$ reacts with $HCl$ to form

$2,3$-dimethylbut-$2$-ene when reacted with bromine forms a compound which upon heating with alcoholic $KOH$ produces the following major product.

$HCl$ does not show the peroxide effect because the reaction mechanism involves the following steps:
$CH_3-CH=CH_2 + \dot{X} \to CH_3-\dot{C}H-CH_2X$ $(I)$
$CH_3-\dot{C}H-CH_2X + HX \to CH_3-CH_2-CH_2X + \dot{X}$ $(II)$
Why does $HCl$ fail to undergo this reaction?

The major product of the following addition reaction is: $CH_3-CH=CH_2 \xrightarrow{Cl_2/H_2O}$

Identify the product $A$ formed when the following compound is treated with $KMnO_4 / H^+$.