On mixing alkane with chlorine and irradiating with ultraviolet light, it forms only one monochloroalkane. The alkane is

Neopentane has 4 primary carbons present in it. All these primary carbons has same environment of protons. Therefore only mono chloro -substitution takes place. i.e Neopentane on reaction with chlorine gives neopentyl chloride as product. HYDROCARBONS 5