Petroleum Refinery Engineering
Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.

Smoking tendency of hydrocarbons increases in the order : paraffins → isoparaffins → naphthenes → aromatics
Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond
Smoking tendency of paraffins increases with decrease in its molecular weight
Smoking tendency of aromatics decreases with increase in its molecular weight

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Petroleum Refinery Engineering
Mercaptans are

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

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