Step- 1 C2H6 + PCl5 → C2H5Cl + PCl3 + HCl [ ethane to ethyl chloride]
Step-2 C2H5Cl + CH3MgCl → CH3CH2CH3 + MgCl2 [ethyl chloride to propane] Propane can be converted to ethane as follows:
Mixture of butane, ethane and propane is called :-