In the elimination of a vicinal dihalide to yield an internal alkyne, two equivalents of NANH2 are required-one for each equivalent of HX that is eliminated. When the product is a terminal alkyne, however, three equivalents of NaNH2 are required. Explain why. Br 2 equiv NaNH, Br Br Br 1.3 equiv NaNH, 2. H,0

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