CTET 2 Math and Science Jan 2012 Paper

CNG (compressed natural gas) is mixture of hydrocarbons. It mainly contain $\mathit{C}{\mathit{H}}_4$
LPG (liquid petroleum gas) is mixture of propane, butane.
Propan:-${\mathit{C}}_3{\mathit{H}}_8$
Butane:- ${\mathit{C}}_4{\mathit{H}}_{10}$
Reaction of hydrocarbons.