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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 4 September 2020, Shift 2, Chemistry Q42

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

In the following reaction sequence, [C] is : [figure: ring drawn as a hexagon with a circle inside, NH2\mathrm{NH_2} at the top and CH3\mathrm{CH_3} at the bottom (opposite positions)] →(ii) Cu2Cl2+HCl(i) NaNO2+HCl, 0-5 ∘C\xrightarrow[\text{(ii) } \mathrm{Cu_2Cl_2 + HCl}]{\text{(i) } \mathrm{NaNO_2 + HCl,\ 0\text{-}5\ ^\circ C}} [A] →hνCl2\xrightarrow[h\nu]{\mathrm{Cl_2}} [B] →Na+dry ether\xrightarrow{\mathrm{Na + dry\ ether}} [C] (Major Product)

The figure, in words

Stem shows reaction scheme with a ring (hexagon with circle inside) bearing NH2 at top and CH3 at bottom; reagents (i) NaNO2 + HCl, 0-5 degC; (ii) Cu2Cl2 + HCl giving [A]; Cl2/h-nu giving [B]; Na + dry ether giving [C] (Major Product). Options are drawn structures.
  1. (1)[figure: two rings (each a hexagon with a circle inside) joined directly by a single bond; CH3\mathrm{CH_3} attached at the far end of each ring, one on the left and one on the right]
  2. (2)[figure: two rings (each a hexagon with a circle inside) joined directly by a single bond; at the far end of each ring a CH2\mathrm{CH_2} group, each CH2\mathrm{CH_2} carrying Cl below it]
  3. (3)[figure: Cl, ring (hexagon with a circle inside), CH2\mathrm{CH_2}, second ring (hexagon with a circle inside), CH2\mathrm{CH_2}, Cl, in a row joined by single bonds]
  4. (4)[figure: Cl, ring (hexagon with a circle inside), CH2\mathrm{CH_2}, CH2\mathrm{CH_2}, second ring (hexagon with a circle inside), Cl, in a row joined by single bonds]Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Haloalkanes and Haloarenes
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. 9 Jan 2020, Shift 1 · Q42The major product Z obtained in the following reaction scheme is : (drawn starting material)…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.