Which among the following is an example of substitution reaction? a. \( \mathrm{CH}_{2}=\mathrm{...

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Which among the following is an example of substitution reaction?
a. \( \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \stackrel{- \text { hv }}{\longrightarrow} \mathrm{CH}_{3}-\mathrm{CH}_{3} \)
b. \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \stackrel{\mathrm{KMnO}_{4} \text { (alk.) }}{\longrightarrow} \mathrm{CH}_{3} \mathrm{COOH} \)
c. \( \mathrm{CH}_{4}+\mathrm{Cl}_{2} \stackrel{\text { hv }}{\longrightarrow} \mathrm{CH}_{3} \mathrm{Cl}+\mathrm{HCl} \)
d. \( \mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+ \) heat and light
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