Identify A and predict the type of reaction

Identify A and predict the type of reaction

1. and elimination addition.
2. and cine substitution reaction.
3. and cine substitution reaction.
4. and substitution reaction.

Solution

More stable as$-\mathrm{ve}$ charge is close to the electron-withdrawing group.
$\because$ Incoming nucleophile ends on the same $\mathrm{C}$on which $\mathrm{Br}$(Leaving group) was present.
$\therefore$ Not cine substitution.

Asked in: NEET 2017

Practice more Halogen Derivatives questions on Aicharya