Question

C.N.G is:
(A)- $\underset{84%}{\mathop{C{{H}_{4}}}}\,$ + Propane + Butane + Higher Alkane
(B)- $\underset{\text{33 }\!\!%\!\!\text{ }}{\mathop{\text{C}{{\text{H}}_{\text{4}}}}}\,\text{+}\,\underset{33%}{\mathop{\text{Ethane}\,}}\,\text{+}\,\underset{33%}{\mathop{\text{Butane}}}\,$
(C)- $\underset{11%}{\mathop{Benzene}}\,\,+\,Petrol$
(D)- $\underset{10%}{\mathop{C{{H}_{4}}}}\,\,+\,\underset{90%}{\mathop{LPG}}\,$

Answer 1

Hint: It is obtained from the naturally occurring gas from the decayed plants and animals, consisting of the mixture of hydrocarbons, but the smallest saturated hydrocarbon (alkane) forms the major constituent in it.

Complete step by step answer:
-CNG is compressed natural gas and as its name suggests is made by compressing the natural gas under very high pressure, such that it only occupies 1 % of the volume at standard atmospheric pressure.
-This natural gas is formed by treating the decomposed layers formed by the dead remains of the plants and animals on the Earth’s surface over the years, at high temperature and pressure, along with various other products like coal and petroleum.
-It is made up of hydrocarbons with a major proportion of Methane (84 %) along with other higher saturated hydrocarbons (higher alkanes) like ethane, propane, butane and also some gases like carbon-dioxide and water vapour. Thus, the methane forms the main constituent of CNG.
-It is preferred over other gases, because on combustion the amount of harmful and undesirable gases produced is lesser in amount, causing less pollution.
-In case of leakage of the gas, it dissipates in the air rather than exploding because it is lighter than it. It is stored in containers under high pressure and can be safely transported through pipelines. Thus, being a renewable source of energy, it is an inexpensive and a safer alternative.

Therefore, C.N.G is option (A)- $\underset{84%}{\mathop{C{{H}_{4}}}}\,$ + Propane + Butane + Higher Alkane.

Note: It is a mixture of saturated hydrocarbons and some gases. Out of which the lowest hydrocarbon with a single carbon atom bonded to four hydrogen atoms is the main constituent.