Chemical Process
Unsaturated oils compared to saturated oils have

Lower melting point & lower reactivity to oxygen
Higher melting point & lower reactivity to oxygen
Higher melting point & higher reactivity to oxygen
Lower melting point & higher reactivity to oxygen

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

All of these
Hydrolysis tendency in presence of water
Poor oxidation stability and high gum forming tendency
Greater tendency of decomposition at elevated temperature

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