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JEE Main Chemistry question

ChemistryHaloalkanes and HaloarenesJEE Main

2-Bromobutane, CHCHBrCHCH, is treated with ethanolic KOH. The major product is a butene with the double bond at position .

Answer: 2

Solution

Base-mediated E2 dehydrohalogenation of 2-bromobutane can remove a -hydrogen from either C1 (giving but-1-ene) or C3 (giving but-2-ene). By Saytzeff's

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Question ID VK-142862