Identify A and predict the type of reaction

• Correct answer
  A

  and elimination addition.
• B

  and cine substitution reaction.
• C

  and cine substitution reaction.
• D

  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.

Hence, the correct answer is option: 'A'.