The light-initiated reaction of 2,3-dimethylbut-2-ene with N-bromosuccinimide (NBS) gives two products:
(a) Give a mechanism for this reaction, showing how the two products arise as a consequence of the resonance-stabilized intermediate.
(b) The bromination of cyclohexene using NBS gives only one major product. Explain why there is no second product from an allylic shift.
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