Which of the dihalides undergo a double dehydroahalogenation to give an alkyne?

Options

A. vic-dihalide
B. gem-dihalide
C. `alpha,omega`- dihalide
D. Both (1) and (2)

Answer

A

Explanation

`underset("vic-dihalide")(-underset(Br)underset(|)(C)H-underset(Br)underset(|)(C))-overset(NaNH_(2))to-C-=-overset(NaNH_(2))larrunderset("gem-dihalide")(CH_(2)-CBr_(2)^(-))`