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Bromination of alkanes is more selective than chlorination mainly because hydrogen abstraction by is

  1. Aunaffected by the type of C-H bond
  2. Bendothermic, with a late transition state that resembles the alkyl radical
  3. Cstrongly exothermic, with an early transition state
  4. Dfaster than abstraction by

Answer: B

is less reactive and the abstraction of H is endothermic, so the transition state is late and product-like. A late transition state feels most of the difference in stability of the 1, 2 and 3 degree radicals, which makes the reaction selective.
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