The most suitable reagent for the following conversion is:
\(\begin{align} CH_3CH_2CH_2CH_3 \rightarrow\ & CH_3CH_2CH_2CH_2Cl\ +\ \\ & CH_3CH_2CHClCH_3\end{align} \)
1. Cl2/UV light
2. NaCl + H2SO4
3. Cl2 gas in the dark
4. Cl2 gas in the presence of iron in the dark
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