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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 25 February 2021, Shift 1, Chemistry Q49

Question 49 of 90 in this shift, Chemistry question 19 of 30, Section A.

Which statement is correct ?
  1. (1)Buna-N is a natural polymer.
  2. (2)Buna-S is a synthetic and linear thermosetting polymer.
  3. (3)Neoprene is an addition copolymer used in plastic bucket manufacturing.
  4. (4)Synthesis of Buna-S needs nascent oxygen.Official answer

Official answer

Option 4

NTA final key.

Chapter
Polymers
Topic
Polymers
Idea tested
Buna-S (SBR) Monomers

Same idea in other shifts

Asked 3× in all
  1. 10 Apr 2023, Shift 2 · Q78Buna-S can be represented as:EasySingle correct
  2. 24 Feb 2021, Shift 2 · Q48In polymer Buna-S : ‘S’ stands for :EasySingle 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.