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JEE Main Chemistry question

ChemistryHaloalkanes and HaloarenesJEE Main

How many of the following reactions form more than one (stereochemically distinct) product: (1) but-1-ene + HBr, (2) acetaldehyde + HCN, (3) chloroethane + alcoholic KOH, (4) bromomethane + NaOH?

Answer: 2

Solution

Markovnikov addition of HBr to but-1-ene creates a new stereocentre at C2, giving a racemic (R/S) pair — two products. HCN addition to acetaldehyde likewise creates a new stereocentre at the cyanohydrin carbon,

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Question ID VK-140468