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Friday, 9 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedEasyRecall

JEE Main 25 July 2022, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

Melamine polymer is formed by the condensation of :

The figure, in words

Options are structures of amino-substituted heterocycles/benzene each plus HCHO.
  1. (1)[figure: 2,4,6-triamino-1,3,5-triazine (melamine, ring with three N and three NH2 groups) + HCHO]Official answer
  2. (2)[figure: 2,4,6-triaminopyrimidine (ring with two N, three NH2 groups) + HCHO]
  3. (3)[figure: 1,3,5-triaminobenzene (three NH2 groups on benzene ring) + HCHO]
  4. (4)[figure: 2,4-diaminopyridine (one ring N, two NH2 groups) + HCHO]

Official answer

Option 1

NTA final key (2022 Session 2).

Chapter
Polymers
Topic
Polymers
Idea tested
Melamine-Formaldehyde Polymer

Same topic in other shifts

All Polymers questions
  1. 6 Apr 2023, Shift 1 · Q79Polymer used in orlon is:EasySingle correct
  2. 11 Apr 2023, Shift 1 · Q78The polymer X - consists of linear molecules and is closely packed. It is prepared in the presence of triethylaluminium and titanium…EasySingle correct
  3. 13 Apr 2023, Shift 2 · Q80Match List I with List II LIST I | LIST II A. Weak intermolecular forces of attraction | I. Hexamethylenediamine + adipic acid B. Hydrogen…MediumMatch the list
  4. 28 Jul 2022, Shift 1 · Q77Terylene polymer is obtained by condensation of :EasySingle correct
  5. 24 Jun 2022, Shift 1 · Q77Which of the following is an example of polyester ?EasySingle correct
  6. 29 Jun 2022, Shift 1 · Q77The polymer, which can be stretched and retains its original status on releasing the force isEasySingle 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.