Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Have affinity to retain harmful sulphur compounds
Cause cholesterol build up and blood clotting
Always contain some amount of nickel (as their complete removal is very difficult)
Are prone to rancid oxidation

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Chemical Process
Fusel oil is a/an

Extract from medicinal herbs
Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses)
Essential oil
None of these

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