JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 31 August 2021, Shift 1, Chemistry Q49

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

Monomer of Novolac is :

(1) $o$ -Hydroxymethylphenol.Official answer
(2)phenol and melamine.
(3)1,3-Butadiene and styrene.
(4)3-Hydroxybutanoic acid.

Official answer

Option 1

NTA final key.

Chapter: Polymers
Topic: Polymers
Idea tested: Novolac Structure and Role

Same idea in other shifts

Asked 3× in all

25 Jun 2022, Shift 2 · Q88The Novolac polymer has mass of 963 g. The number of monomer units present in it are ________MediumNumerical value
25 Jul 2021, Shift 1 · Q48[figure: polymer repeating unit $-(\mathrm{CH_2}$ -C6H3(OH)- $\mathrm{CH_2}$ -C6H3(OH)- $\mathrm{CH_2})-$ , phenol rings joined through CH2…EasySingle correctHas a figure

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.