Petroleum Refinery Engineering
Olefins are

Saturated hydrocarbons
Present in substantially good quantity in crude petroleum
None of these
Unsaturated cyclic compounds (hydrocarbons)

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Petroleum Refinery Engineering
In catalytic cracking, the

Pressure & temperature is very high
Gasoline obtained has a very low octane number
Gasoline obtained has very high amount of gum forming compounds
Gasoline obtained has very high aromatic content

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