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JEE Main Chemistry question

ChemistryHaloalkanes and HaloarenesJEE Main

In the dehydrohalogenation of 2-bromobutane, one conformation leads to the formation of cis-2-butene and another leads to trans-2-butene. What is the multiplication of the assigned numbers for these two conformations (identified among four given Newman projections)?

Answer: 4

Solution

Anti-periplanar elimination (E2) requires the leaving bromide and the departing -hydrogen to be at to each other in the reacting conformation. Of the four Newman projections given,

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Question ID VK-148389