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JEE Main Chemistry question

ChemistryHydrocarbonsJEE Main

Suitable reagents and for the following reactions — cyclobutene + → an allylic bromide (ring with –Br on the carbon adjacent to the remaining double bond, no addition across C=C); cyclobutene + → the vicinal dibromocyclobutane (addition across the former C=C) — are

Answer: (D)

Solution

NBS provides a low, steady concentration of Br and favours radical *allylic substitution* (abstraction of an allylic H, leaving the double bond intact, with Br ending up on the adjacent

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Question ID VK-142316