Which among the following is not obtained when ethyl chloride and n-propyl chloride undergoes Wurtz reaction?
2CH3CH2−Cl+2NaDryether−−−−−−−→CH3CH2CH2CH3(n−butane)+2NaCl
CH3CH2−Cl+CH3CH2CH2−Cl+2NaDryether−−−−−−−→CH3CH2CH2CH2CH3(n−pentane)+2NaCl
2CH3CH2CH2−Cl+2NaDryether−−−−−−−→CH3CH2CH2CH2CH2CH3(n−hexane)+2NaCl
But (CH3)2CHCH3(isobutane) is not possible to prepare using ethyl chloride and propyl chloride.