Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	Olefinic monomers undergo addition polymerization.
Reason (R):	Polymerisation of vinyl chloride is initiated by peroxides/persulphates.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

HINT: Olefin also called an alkene.

Explanation:

Olefin monomers undergo addition polymerization because it adds on to other monomers of olefin through a free radical mechanism due to the presence of a peroxide initiator. The example addition polymerization is as follows:

The polymerization of vinyl chloride is initiated by peroxides/persulphates because it follows free radical mechanism and it is also an example of addition polymerization.

The reaction is as follows:

Hence, Assertion and Reason both are correct statements But reason does not explain Assertion.

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