Which of the species shown below is the most stable form of the intermediate in the electrophilic addition of $Cl_2$ in water to cyclohexene to form a halohydrin?

Consider the following reaction:
$Alkene (A) \xrightarrow{KMnO_4, \Delta} CH_3CH_2COCH_3 + CH_3CH_2CH_2CH_2COOH$
$A$ is:

Predict the major product $A$ for the following reaction:
$2\text{-methylbuta-1,3-diene} + HBr (1 \text{ eq.}) \xrightarrow{-80^{\circ}C (1,2\text{-addition})} A$

In the reaction $CH_2=CH_2$ $\xrightarrow{HOCl} M$ $\xrightarrow{R} HO-CH_2-CH_2-OH$,where $M$ is a molecule and $R$ is a reagent,$M$ and $R$ are:

The percentage composition of an organic compound $A$ is: carbon = $85.71 \%$ and hydrogen = $14.29 \%$. Its vapour density is $14$. Consider the following reaction sequence:
$A$ $\xrightarrow{Cl_2/H_2O} B$ $\xrightarrow[(ii) H_3O^+]{(i) KCN/EtOH} C$
Identify $C$.

The conversion of $2,3-$dibromobutane to $2-$butene with $Zn$ is