Petroleum Refinery Engineering
Olefins are

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

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Petroleum Refinery Engineering
Mercaptans are

Low boiling sulphur compounds
Added in LPG cylinders to detect gas leakage by its smell
All of these
Undesirable in petrol, as they reduce its octane number

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