Question

Two carbon compounds A and B have the molecular formula C3

H8

and C3

H6 respectively.

Which one of the two is most likely to show addition reaction? Justify your answer. Explain

with the help of a chemical equation, how an addition reaction is useful in vegetable ghee

industry.

Answer 1

C3

H6

will show addition reaction. C3

H6

is an unsaturated compound with a double bond. Veg-

etable oils have long unsaturated carbon chains which on addition of hydrogen in the presence

of catalyst Nickel, change in to saturated carbon chains. This is called hydrogenation of oils.2

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Answer 2

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.

heat

C2H4 +H2 --------->. C2H6

Ni catalyst

Hydrogenation 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.

heat

veg.oil + H2 ---------> Veg.Ghee

Ni

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