What is the order of reactivity of hydrogen atoms attached to the carbon atom in an alkane for free radical substitution?

3^{o} > 1^{o} > 2^{o}

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2^{o} > 1^{o} > 3^{o}

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3^{o} > 2^{o} > 1^{o}

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1^{o} > 2^{o} > 3^{o}

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Solution

The correct option is D $3^{o} > 2^{o} > 1^{o}$
REF: free radical will have $9 α H .$

$C H_{3} - C H_{2} - C H_{3}$ free radical will have $6 α H$

$C H_{3} - C H_{3} - H$ free radical will have $3 α H$

As no.of $α - H$ increase stability of free radical increase
reactivity order of H $3^{\circ} > 2^{\circ} > 1^{\circ}$

Hence, te correct option is $C$

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