Explain the regioselectivity observed in the radical addition of HBr to 2-methylpropene.

Name: Explain the regioselectivity observed in the radical addition of HBr to 2-methylpropene.
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The Answer is The reaction proceeds via the addition of Br^∙ to the alkene. Two competing pathways are possible, but the transition state leading to the more substituted alkyl radical is lower in energy. This process ultimately makes the addition anti-Markovnikov in nature.

Explain the Regioselectivity Observed in the Radical Addition of HBr