The correct option is C propane
∙ An unsaturated hydrocarbon is converted to a saturated hydrocarbon by the addition of hydrogen atoms in the presence of nickel catalyst.
∙ The hydrogen atoms are added to the carbon atoms having a double bond or a triple bond between them.
∙ For example, prop-1-ene is converted to propane as shown below.
CH3−CH=CH2(g) + H2(g) Ni→ CH3−CH2−CH3(g) Prop−1−ene Hydrogen Propane