Question

We studied that on combustion of alkanes a huge amount of energy is released. This makes hydrocarbons a very good source of energy and they are used in different fuels. Find out the hydrocarbons that are present in the following fuels.

1. LPG
2. LNG
3. CNG
4. Diesel
5. Petrol

Answer 1

Fuel	Main Hydrocarbons Present
(i) LPG (Liquefied Petroleum Gas)	Propane (C3H8) and Butane (C4H10)
(ii) LNG (Liquefied Natural Gas)	Methane (CH4) (typically above 85-90%)
(iii) CNG (Compressed Natural Gas)	Methane CH4
(iv) Diesel	Long-chain Alkanes (containing roughly 12 to 20 carbon atoms, like C12H26 to C20H42)
(v) Petrol (Gasoline)	Medium-chain Alkanes (containing roughly 4 to 12 carbon atoms, such as Octane C8H18)