Question

Vicinal dihalides undergo double dehydrohalogenation to give terminal alkyne. How many moles of `NaNH_2` are used in the overall reaction?
A. One
B. Two
C. Three
D. Four

Answer 1

Correct Answer - C

Double dehydrohalogenation requires 2 mol of `NaNH_2`. The terminal alkyne is converted to alkynyl anion as soon as it is formed. Thus, 3 mol of `NaNH_2` of the base are used in the overall reaction.