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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 25 February 2021, Shift 1, Chemistry Q47

Question 47 of 90 in this shift, Chemistry question 17 of 30, Section A.

Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are : A = [structure] B = [structure] C = [structure]

The figure, in words

A: benzene ring with NH2 at the top vertex, NH2 at the lower-left vertex, NH2 at the lower-right vertex and OH at the bottom vertex. B: benzene ring with a single COOH substituent at the top. C: benzene ring with OH at the top vertex, NO2 at the upper-left vertex, NO2 at the upper-right vertex and NO2 at the bottom vertex.
  1. (1)A and B only
  2. (2)C only
  3. (3)B and C onlyOfficial answer
  4. (4)B only

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Organic Acidity and Basicity
Idea tested
Exceptional Acidity of Picric Acid

Same topic in other shifts

All Organic Acidity and Basicity questions
  1. 4 Apr 2026, Shift 1 · Q66Amongst the following, the total number of compounds soluble in aqueous NaOH at room temperature is:MediumDiagram basedHas a figure
  2. 4 Apr 2026, Shift 2 · Q66The descending order of acidity among the following compounds is: A. phenol B. 4-nitrophenol (O2N\mathrm{O_2N} para to OH on the benzene…MediumOtherHas a figure
  3. 3 Apr 2025, Shift 1 · Q67The least acidic compound, among the following is: (A) [structure: 3-ethoxyphenol, EtO and OH meta on a benzene ring] (B) [structure:…MediumDiagram basedHas a figure
  4. 7 Apr 2025, Shift 1 · Q68Which of the following compounds is least likely to give effervescence of CO2\mathrm{CO_2} in presence of aq. NaHCO3\mathrm{NaHCO_3} ?EasyDiagram basedHas a figure
  5. 8 Apr 2025, Shift 2 · Q61Match the LIST-I with LIST-II LIST-I (Reagent) | LIST-II (Functional Group detected) A. Sodium bicarbonate solution | I. double bond/…MediumMatch the list
  6. 4 Apr 2024, Shift 1 · Q63What will be the decreasing order of basic strength of the following conjugate bases ? O‾H\overline{\mathrm{O}}\mathrm{H},…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.