CUET Preparation Today
Identify 'A' From the given reaction:
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2-Butyne Buta-1,3-diene But-1-ene 2-Bromobutane |
2-Butyne |
The correct answer is option 1. 2-Butyne. The given reactant in question is 2,3-Dibromobutane. When 2,3-dibromobutane is treated with excess sodium amide (\(\text{NaNH}_2\)), the reaction leads to the formation of 2-butyne through a double dehydrohalogenation process. An application of \(NaNH_2\) is in the formation of alkynes from halogens. Treatment of either geminal dihalides (i.e. – two halogens on one carbon) or vicinal dihalides (halogens on adjacent carbons) with \(NaNH_2\) (2 equiv) will result in the formation of alkynes.
Mechanism:
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