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Markovnikov Addition of HBr to an Alkene

Organic

Diagram showing HBr adding to methylenecyclopentane, comparing primary and tertiary carbocations, with the tertiary Markovnikov pathway as major.

Alkenes

HBr adds to methylenecyclopentane through the more stable tertiary carbocation, giving the Markovnikov product 1-bromo-1-methylcyclopentane.

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