Learn

Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 17 March 2021, Shift 2, Chemistry Q60

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

[reaction scheme] Consider the above reaction. The percentage yield of amide product is __________. (Round off to the Nearest Integer). (Given : Atomic mass : C : 12.0 u, H : 1.0 u, N : 14.0 u, O : 16.0 u, Cl : 35.5 u)

The figure, in words

Reaction scheme: left a benzene ring bearing a C(=O)-Cl group (C double bonded to O, single bond to Cl), labelled 0.140 g; + C6H5NHC6H5 labelled 0.388 g; arrow; product C6H5-C(=O)-N-(C6H5)2 (C double bonded to O above) labelled 0.210 g.

Official answer

77

NTA final key.

Chapter
Amines
Topic
Stoichiometry
Idea tested
Theoretical and Percent Yield

Same idea in other shifts

Asked 7× in all
  1. 27 Jul 2022, Shift 2 · Q90In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is __________…EasyNumerical valueHas a figure
  2. 29 Jul 2022, Shift 1 · Q89In bromination of Propyne, with Bromine 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2-tetrabromopropane…MediumNumerical value
  3. 24 Feb 2021, Shift 2 · Q601.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained…EasyNumerical value
  4. 22 Jul 2021, Shift 2 · Q60Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene ________. (Nearest integer)EasyNumerical value
  5. 17 Mar 2021, Shift 1 · Q60[reaction drawn: see figure_note] In the above reaction, 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield…EasyNumerical valueHas a figure
  6. 18 Mar 2021, Shift 2 · Q59[figure: reaction scheme] Consider the above reaction where 6.1 g of Benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The…EasyNumerical valueHas 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. 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.