Question

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Answer 1

compound A is C3H8. its propane saturated hydrocarbon.it does not undergo addition reaction.compound B is C3H6.Its Propene unsaturated hydrocarbon. it undergoes addition reaction.Addition reaction involves addition of H2 to unsaturated hydrocarbon in presence of Nickel catalyst when they are heated. it gives saturated hydrocarbon.heatC2H4 +H2 --------->. C2H6Ni catalystHydrogenation of oil: Vegetable oil like ground nut oil which is liquid at room temperature undergoes addition reaction and gives vegetable ghee or dalda.vegetable oil contains unsaturated fatty acids which are good for our health.heatveg.oil + H2 ---------> Veg.Ghee

Answer 2

C3H8 corresponds to the general formula CnH2n+2 (n =3), therefore its an alkane which is a saturated compound. The molecular formula, C3H6 corresponds to the general formula CnH2n (n=3) therefore it is an alkene, which is an unsaturated compound. Since alkenes contain a double bond, therefore C3H6 is more reactive than C3H8. H2 is added in presence of a catalyst to form saturated hydrocarbons for example,

This addition reaction is useful in industry for converting vegetable ghee. Vegetable oils contain a number of unsaturated carbon chains having double bonds between carbon atoms. When H2 gas is bubbled through vegetable oils in presence of Nickel as catalyst at 473K, some of these double bonds add H2 to form saturated carbon chains. As a result of this partial hydrogenation, vegetable ghee is formed.