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Reactivity of hydrogen atoms attached to different carbon atoms in alkanes has the order:

1. Tertiary > Primary > Secondary
2. Primary > Secondary > Tertiary
3. Both (a) and (b)
4. Tertiary > Secondary > Primary

Correct answer: Tertiary > Secondary > Primary

Solution

The reactivity of hydrogen atoms in alkanes follows the order tertiary > secondary > primary because tertiary carbons form the most stable carbocations during reactions like free radical halogenation.

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