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 $C$.

What is the major product obtained from the debromination of meso-$2,3$-dibromobutane?

Which of the following compounds gives $CH_3CHO$ and $CH_3CH_2CHO$ upon ozonolysis followed by hydrolysis?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Cis form of alkene is found to be more polar than the trans form.
Reason $(R)$: Dipole moment of trans isomer of $2$-butene is zero.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following acids adds to propene in the presence of peroxide to give anti-Markownikoff's product?

The major product formed in the following reaction is :
$CH_3CH=CHCH(CH_3)_2 \xrightarrow{HBr}$