Learn

Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 26 June 2022, Shift 2, Chemistry Q79

Question 79 of 90 in this shift, Chemistry question 19 of 30, Section A.

Which of the following is NOT an example of synthetic detergent?

The figure, in words

Options A and C contain drawn parts (benzene ring in A; bracketed cation with N carrying CH3 above and below in C).
  1. (1)CH3−(CH2)11\mathrm{CH_3-(CH_2)_{11}}-[drawn benzene ring]-SO3−Na+\mathrm{SO_3^-Na^+}
  2. (2)CH3−(CH2)16−COO−Na+\mathrm{CH_3-(CH_2)_{16}-COO^- Na^+}Official answer
  3. (3)[drawn structure in square brackets with + charge: CH3−(CH2)15−N−CH3\mathrm{CH_3-(CH_2)_{15}-N-CH_3} with CH3 drawn above and below the N; Br−\mathrm{Br^-} outside the bracket]
  4. (4)CH3(CH2)16COO(CH2CH2O)nCH2CH2OH\mathrm{CH_3(CH_2)_{16}COO(CH_2CH_2O)_nCH_2CH_2OH}

Official answer

Option 2

NTA final key.

Chapter
Chemistry in Everyday Life
Topic
Chemistry in Everyday Life
Idea tested
Soaps and Detergents

Same idea in other shifts

Asked 3× in all
  1. 26 Jul 2022, Shift 1 · Q78Stearic acid and polyethylene glycol react to form which one of the following soap/s detergents ?EasySingle correct
  2. 27 Jul 2022, Shift 2 · Q78Which of the following enhances the lathering property of soap ?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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.