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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 28 June 2022, Shift 2, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

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

Official answer

Option 3

NTA final key.

Chapter
Polymers
Topic
Polymers
Idea tested
Natural and Synthetic Rubber

Same idea in other shifts

Asked 2× in all
  1. 26 Jul 2022, Shift 2 · Q78Vulcanization of rubber is carried out by heating a mixture ofEasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.