Petroleum Refinery Engineering
Straight run petrol as compared to methyl/ethyl alcohol has

Higher ignition temperature
Lower calorific value
Higher specific gravity
Lower octane number

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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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