During halogenation of an alkane, the ease of replacement of hydrogen atoms follows the order:

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$3^\circ$ H - atom > $2^\circ$ H - atom > $1^\circ$ H - atom Explanation: During halogenation of alkanes, a hydrogen atom is replaced through a free radical substitution reaction. The ease of replacement depends on the stability of the alkyl free radical formed after the removal of hydrogen. Radical stability order: 3∘ radical > 2∘ radical > 1∘ radical

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