How to get butane from methane reaction formula?

1. To solve, we make a chain of transformations:
CH4 – CH3Cl – C4H10;
2. Let’s write down the reaction equations:
CH4 + Cl2 = CH3Cl + HCl – substitution occurs in the light, methane chloride is released;
CH3Cl + 2Na + C3H7Cl = C4H10 + 2NaCl – butane was obtained in the Wurtz reaction.
3. The reactions presented show the possibility of obtaining homologous substances by lengthening the carbon chain. Reaction products find use, for example, ethane chloride as a solvent, butane is used as a fuel.