Per NCERT §9.3.6 (electrophilic addition mechanism), the rate-determining intermediate in HBr + propene addition is which species?
ACarbene
BCarbanion
CFree radical
DCarbocation
Answer & Solution
Correct answer: D. Carbocation
NCERT §9.3.6: H⁺ adds first, generating a carbocation (2° more stable than 1°), then Br⁻ attacks. Polar / ionic mechanism.
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