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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 11 April 2023, Shift 1, Chemistry Q78

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

The polymer X - consists of linear molecules and is closely packed. It is prepared in the presence of triethylaluminium and titanium tetrachloride under low pressure. The polymer X is-
  1. (1)Polytetrafluoroethane
  2. (2)Polyacrylonitrile
  3. (3)High density polytheneOfficial answer
  4. (4)Low density polythene

Official answer

Option 3

NTA final key.

Chapter
Polymers
Topic
Polymers
Idea tested
HDPE vs LDPE and Ziegler-Natta Catalyst

Same idea in other shifts

Asked 2× in all
  1. 11 Apr 2023, Shift 2 · Q80Given below are two statements : Statement I : Ethene at 333 to 343K and 6-7 atm pressure in the presence of AlEt3\mathrm{AlEt_3} and…MediumTwo statements

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.