Explain the use of hydrogen in the formation of vegetable fats.

Explanation

Hydrogen is employed for the conversion of polyunsaturated vegetable iols like soyabean, cotton seeds into vegetable fats like dalda, gagan etc.
`underset("Liquid")("Vegetable oil")+H_(2)underset(473K)overset(Ni)to underset("Solid")("Fat")`
The reaction occurs in the presence of nickel catalyst and at a temperature of 473K.