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Q.
Gasoline has composition :
AFMCAFMC 2004
Solution:
The process of obtaining useful fractions with different boiling ranges and free from undesirable temperature is known as refining of crude oil. The various fractions obtained have different number $C$-atoms
Petroleum ether $=C_{5}-C_{7}$
Gasoline $C _{7}- C _{12}$
Kerosene $C_{12}-C_{15}$
Gas oil, fuel oil, diesel $C_{15}-C_{18}$