JEE Main 2022 · 28 Jun · Shift 2 · Chemistry Q78

ChemistrySingle correct+4 / -1Question 78 of 90

Given below are two statements, one is Assertion (A) and other is Reason (R).

Assertion (A) : Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties.

Reason (R) : The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with coiled structure.

In the light of the above statements, choose the correct one from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

Answer and worked solution

Official answer: C

Assertion true. Reason false: the cis-polyisoprene chains are held by weak van der Waals forces, not strong polar interactions.

(C)

Topics:Common polymers

JEE Main 2022 · 28 Jun · Shift 2, Chemistry question 78