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

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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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