The reaction of propene with $Cl_2$ at $400-600\,^oC$ gives...........

What is the major product formed when $cis-2-butene$ reacts with $Br_2$ in $CCl_4$?

In the reaction
$CH_3-CH=CH_2$ $\xrightarrow{Cl_2/500\,^{\circ}C} A$ $\xrightarrow{Na/\text{dry ether}} B$
$B$ is

$[CH_3-CH_2-CH(CH_3)-N^{+}(CH_3)_3]OH^{-} \xrightarrow{\text{pyrolysis}}$ major alkene will be

$A$ hydrocarbon $X$ adds one mole of hydrogen to give another hydrocarbon and decolourises bromine water. $X$ reacts with $KMnO_4$ in the presence of acid to give two moles of the same carboxylic acid. The structure of $X$ is:

Cyclohexene on oxidation with $KMnO_4$ in dil. $H_2SO_4$ forms.