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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 4 August 2021, Shift 2, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

[reaction scheme: see figure_note] In the reactions above, yield of the first step is 90% and that of the second step is 80%. The overall yield of the reaction is ________ %.

The figure, in words

Left to right: a benzene ring (double bonds drawn, no circle) with NH2 attached at the top; arrow labelled 'NaNO2 + HCl' above and '0-5oC' below (printed as 0-5 degree-like mark 'o'); then a benzene ring with N2+ Cl- attached at the top (the + drawn as a superscript on N2); arrow labelled 'CuCl'; then a benzene ring with Cl attached at the top.

Official answer

72

NTA final key.

Chapter
Amines
Topic
Stoichiometry
Idea tested
Overall Yield of Sequential Reactions

Same topic in other shifts

All Stoichiometry questions
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  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.