Which of the following, upon treatment with tert-$\mathrm{BuONa}$ followed by addition of bromine water, fails to decolourize the colour of bromine?

The major product of the following reaction is:

The major product of the reaction:

is :

Which one of the following reagents is not suitable for the elimination reaction?

The major product of the following reaction is:

The major product of the following reaction is:

${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{CH}}_2-\mathrm{C}\left({\mathrm{CH}}_3\right)\left(\mathrm{Br}\right) -{\mathrm{CH}}_2-{\mathrm{CH}}_3\underset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}}{\to }} \left[\mathrm{A}\right]$

The major product formed in the following reaction is:

The major product of the following reaction is:

The major product of the following reaction is: