Learn

Saturday, 31 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 27 July 2022, Shift 1, Chemistry Q90

Question 90 of 90 in this shift, Chemistry question 30 of 30, Section B.

In the following reaction [figure: benzene →Oleum\xrightarrow{\text{Oleum}} (I) benzene bearing SO3H\mathrm{SO_3H} →NaOH (excess)/H+\xrightarrow{\text{NaOH (excess)/H}^+} (II) benzene bearing OH] The % yield for reaction I is 60% and that of reaction II is 50%. The overall yield of the complete reaction is __%. [nearest integer]

The figure, in words

Three benzene rings (hexagon with alternating double bonds) in a row: plain benzene, then arrow labelled Oleum (I) to benzene with SO3H at the top, then arrow labelled NaOH (excess) over H+ (II) to benzene with OH at the top.

Official answer

30

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Stoichiometry
Idea tested
Stoichiometry of Sequential Reactions

Same topic in other shifts

All Stoichiometry questions
  1. 2 Apr 2026, Shift 1 · Q51The mass of iron converted into Fe3O4\mathrm{Fe_3O_4} by the action of 1818 g of steam is : (Given : Molar mass of H, O and Fe are 1,161, 16…EasySingle correct
  2. 2 Apr 2026, Shift 2 · Q51The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of CO2(g)CO_2(g) formed…MediumSingle correct
  3. 2 Apr 2026, Shift 2 · Q62Complete combustion of X g of an organic compound gave 0.25 g of CO2CO_2 and 0.12 g of H2OH_2O. If the % of carbon is 25% and of hydrogen is…MediumSingle correct
  4. 2 Apr 2026, Shift 2 · Q75Consider the following reactions sequence…MediumNumerical value
  5. 4 Apr 2026, Shift 2 · Q75In sulphur estimation, 2.0×10−32.0\times10^{-3} mol of an organic compound (X) (molar mass 76 g mol−1\mathrm{g\ mol^{-1}}) gave 0.4813 g of barium…EasyNumerical value
  6. 5 Apr 2026, Shift 1 · Q51How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given : Molar mass of C, O and Ag are 12, 16 and 108 g…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.