Question

A vegetable oil contains two double bonds in its molecule. How many moles of hydrogen gas are required for complete hydrogenation of 1 mole of oil?

Answer 1

Consider the following reaction: 

Note that one double bond is hydrogenated using 1 mole of H₂. 

∴ If there are 2 double bonds in the vegetable oil, then 2 moles of H₂ will be required for complete hydrogenation of 1 mole of the oil.