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When isobutane (2-methylpropane) undergoes free radical bromination in the presence of light, what iHydrocarbons Chemistry Question

Question

When isobutane (2-methylpropane) undergoes free radical bromination in the presence of light, what is the structure of the overwhelmingly major product (>99%)?

Answer: A

💡 Solution & Explanation

Bromine radicals are highly selective ($1600 : 82 : 1$ for $3^\circ : 2^\circ : 1^\circ$). They almost exclusively abstract the stable tertiary hydrogen, yielding 2-bromo-2-methylpropane (*tert*-butyl bromide).

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