Both vicinal dihalides and geminal dihalides undergo dehydrohalogenation reaction with a strong base to give alkyne in fairly good yield. The reaction follows 1, 2-elimination mechanism. 1 the first step, the base employed is alcoholic KOH while in the subsequent step, we need a strong base like sodamide as vinyl halide is less reactive towards elimination.
NaNH2 is preferred over alc. KOH in the second step as alc KOH finds it difficult to fetch a hydrogen halide molecule as the two leaving groups are attached to sp2 hybridised irbon atoms.
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