M/J 2019/P12/Q35
Which reaction is an addition reaction?
A making ethane and ethene from butane
B making ethene and hydrogen from butane
C the manufacture of margarine from a vegetable oil
D the reaction between ethene and oxygen, giving carbon dioxide and water
Answer: C
Explaination
Addition reaction comes under the chemical reaction of alkenes in which atoms are added across the double bond results in a single saturated product.
Option A and B are the examples of cracking as in this process large alkane molecules are cracked to form smaller hydrocarbon molecules.
Option C is correct as alkenes are unsaturated HC contains C=C. The manufacturing of margarine from a vegetable comes under addition reaction of alkene (hydrogenation), in which atoms are added across the double bond of alkene results in a single saturated product.
Option D is a combustion reaction in which alkene burn with oxygen to give CO2 and H2O.
