Q.

Vicinal dihalides undergo double dehydrohalogenation to give terminal alkyne. How many moles of NaNH2 are used in the overall reaction?

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a

One

b

Two

c

Three

d

Four

answer is C.

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Detailed Solution

Double dehydrohalogenation requires 2 mol of NaNH2. The terminal alkyne is converted to alkynyl anion as soon as it is formed. Thus, 3 mol of NaNH2 of the base are used in the overall reaction.
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Vicinal dihalides undergo double dehydrohalogenation to give terminal alkyne. How many moles of NaNH2 are used in the overall reaction?