Bromination of cyclohexene under conditions given below yields:

In the following sequence of reactions, ${\mathrm{C}}_3{\mathrm{H}}_6\stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{⟶}\mathrm{A}\frac{\mathrm{KIO}}{\mathrm{dilKOH}}\mathrm{B}+\mathrm{C}$.  The compounds $\mathrm{B}$ and $\mathrm{C}$ respectively are :

The major product '$\mathrm{A}$' of the following given reaction has ${\mathrm{sp}}^2$ hybridized carbon atoms.

$2,7$-Dimethyl-$2,6$-octadiene $\stackrel{{\mathrm{H}}^{+}}{⟶}\underset{\mathrm{Major} \mathrm{Product}}{\mathrm{A}}$

The product formed in the following reaction.

is:

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

The major product formed in the following reaction, is