\[ \mathrm{CH}_{4}+\mathrm{X}_{2} \underset{\text { or hightemp }}{...
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\[
\mathrm{CH}_{4}+\mathrm{X}_{2} \underset{\text { or hightemp }}{\stackrel{\text { hv }}{\longrightarrow}} \mathrm{CH}_{3}-\mathrm{X}
\]
Order of reactivity of halogen is
\( \mathrm{P} \)
(A) \( \mathrm{I}_{2}\mathrm{Br}_{2}\mathrm{Cl}_{2}\mathrm{F}_{2} \)
(B) \( \mathrm{F}_{2}\mathrm{Cl}_{2}\mathrm{Br}_{2}\mathrm{I}_{2} \)
(C) \( \mathrm{Br}_{2}\mathrm{Cl}_{2}\mathrm{I}_{2}\mathrm{F}_{2} \)
(D) \( \mathrm{Cl}_{2}\mathrm{Br}_{2}\mathrm{F}_{2}\mathrm{I}_{2} \)
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