Petroleum Refinery Engineering
Research octane number refers to the

Low octane number motor fuels
Unleaded motor fuels
High octane number motor fuels
High octane number aviation fuels

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Petroleum Refinery Engineering
Mercaptans are

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

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