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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 9 January 2020, Shift 1, Chemistry Q42

Question 42 of 75 in this shift, Chemistry question 17 of 25, Section A.

The major product Z obtained in the following reaction scheme is : (drawn starting material) →273-278 KNaNO2/HCl\xrightarrow[\text{273-278 K}]{\mathrm{NaNO_2/HCl}} X →Cu2Br2\xrightarrow{\mathrm{Cu_2Br_2}} Y →H2SO4HNO3\xrightarrow[\mathrm{H_2SO_4}]{\mathrm{HNO_3}} Z

The figure, in words

Starting material drawn: six-membered ring with inner double-bond lines, NH2\mathrm{NH_2} on the top vertex and Br on the lower-left vertex. Reagents printed over arrows: NaNO2/HCl\mathrm{NaNO_2/HCl} with 273-278 K below the first arrow to X; Cu2Br2\mathrm{Cu_2Br_2} over the arrow X to Y; HNO3\mathrm{HNO_3} over and H2SO4\mathrm{H_2SO_4} under the arrow Y to Z (on a second line). Options are drawn ring structures.
  1. (1)[figure: six-membered ring drawn with inner double-bond lines; Br on the top vertex, Br on the lower-left vertex, NO2\mathrm{NO_2} on the bottom vertex]Official answer
  2. (2)[figure: six-membered ring drawn with inner double-bond lines; three adjacent substituents: Br, then O2N\mathrm{O_2N} in the middle, then Br]
  3. (3)[figure: six-membered ring drawn with inner double-bond lines; NO2\mathrm{NO_2} on the top vertex, Br on the lower-left vertex, Br on the lower-right vertex]
  4. (4)[figure: six-membered ring drawn with inner double-bond lines; NO2\mathrm{NO_2} on the upper-right vertex, Br on the lower-right vertex, NO2\mathrm{NO_2} on the bottom vertex, Br on the lower-left vertex]

Official answer

Option 1

NTA final key (Jan 2020).

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Sandmeyer Reaction

Same idea in other shifts

Asked 7× in all
  1. 5 Apr 2024, Shift 1 · Q88The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is ________. [figure: five monohalobenzenes I-V…EasyNumerical valueHas a figure
  2. 6 Apr 2024, Shift 2 · Q77Identify the product (A) in the following reaction. Aniline (benzene ring with NH2\mathrm{NH_2})…MediumDiagram basedHas a figure
  3. 15 Apr 2023, Shift 1 · Q75[figure: 4-nitrotoluene (benzene ring with CH3\mathrm{CH_3} at top and NO2\mathrm{NO_2} at bottom) ⟶⟶\longrightarrow\longrightarrow benzoic…HardDiagram basedHas a figure
  4. 24 Feb 2021, Shift 2 · Q47What is the correct sequence of reagents used for converting nitrobenzene into mm-dibromobenzene ? [Scheme: nitrobenzene →\rightarrow…MediumDiagram basedHas a figure
  5. 26 Feb 2021, Shift 2 · Q46Match List-I with List-II. List-I | List-II (a) [figure: benzene ring with N2+Cl−\mathrm{N_2^+Cl^-}] →Cu2Cl2\xrightarrow{\mathrm{Cu_2Cl_2}}…MediumMatch the listHas a figure
  6. 4 Sep 2020, Shift 2 · Q42In the following reaction sequence, [C] is : [figure: ring drawn as a hexagon with a circle inside, NH2\mathrm{NH_2} at the top and…MediumDiagram basedHas 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.