Which of the following is an α - elimination reaction?
CHX3 Alc.KOH/△−−−−−−−→ :CX2 + ⊖X + ⊕H
Option (c) is not an elimination reaction because nothing is removed.
Now, what is α - elimination?
The reaction in which 2 atoms from a molecule are removed from the same atom is called α - elimination.
It leads to the formation of an electron-deficient reactive intermediate.