The alkene shown reacts with $HBr$ in the dark (no peroxide). Which structure is the major product?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B

The alkene is 1-methylcyclohexene. Protonation of the less substituted alkene carbon gives the tertiary carbocation, and bromide then attacks it (Markovnikov addition). The product is 1-bromo-1-methylcyclohexane.

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The alkene shown reacts with HBr in the dark (no peroxide). Which structure is the major product?

Answer: B

More questions on Markovnikov and anti-Markovnikov products of drawn alkenes

The alkene shown reacts with $HBr$ in the dark (no peroxide). Which structure is the major product?