Question

addition reaction of fatty acids

Answer 1

In addition to their reacting with iodine, unsaturated fats and oils react with hydrogen. Like iodine atoms, hydrogen atoms add across the carbon-carbon double bonds. A polyhydrogenated fat is one that has been altered by such a reaction. The reaction may cause the oil to become a solid.

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Answer 2

Any fatty compund having double or triple bond.
C=C + H ---------> CH2-CH2
The above reaction takes place in presence of nickel or palladium