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The ease of reaction for hydrogen atoms is influenced by the stability of the associated free radicals, which decreases in the order: tertiary > secondary > primary. Hence, hydrogen atom reactivity mirrors this trend, being highest for tertiary free radicals.

1. Free radical formed from a tertiary carbon
2. Free radical formed from a secondary carbon
3. Free radical formed from a primary carbon
4. Free radical formed from a methyl group

Correct answer: Free radical formed from a tertiary carbon

Solution

The stability of free radicals follows the order tertiary > secondary > primary > methyl due to hyperconjugation and inductive effects. Hence, the reactivity of H-atoms also follows the same order, making tertiary free radicals the most reactive.

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