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JEE Main Chemistry question

ChemistryHaloalkanes and HaloarenesJEE Main

How many products (with both bromine atoms substituted) will form when 2,4-dibromopentane is treated with aq. KCN?

Answer: 4

Solution

2,4-Dibromopentane has two stereocentres (C-2 and C-4) related by the molecule's internal symmetry (both bear a methyl, H, Br, and the central ). Each substitution proceeds with inversion at that centre; considering the possible combinations of

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Question ID VK-148400