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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 18 March 2021, Shift 1, Chemistry Q40

Question 40 of 90 in this shift, Chemistry question 10 of 30, Section A.

The correct structures of trans-[NiBr2(PPh3)2]\mathrm{[NiBr_2(PPh_3)_2]} and meridional-[Co(NH3)3(NO2)3]\mathrm{[Co(NH_3)_3(NO_2)_3]}, respectively, are :

The figure, in words

Each option shows a square-planar NiBr2(PPh3)2 structure and an octahedral Co(NH3)3(NO2)3 structure.
  1. (1)[figure: square planar Ni with both PPh3 on the left (top-left, bottom-left) and both Br on the right (top-right, bottom-right); and octahedral Co with NO2 (top), O2N (top-left), NH3 (top-right), O2N (bottom-left), NH3 (bottom), NH3 (bottom-right)]
  2. (2)[figure: square planar Ni with PPh3 top-left, Br top-right, Br bottom-left, PPh3 bottom-right; and octahedral Co with H3N (top-left), NO2 (top), NO2 (top-right), O2N (bottom-left), NH3 (bottom), NH3 (bottom-right)]Official answer
  3. (3)[figure: square planar Ni with PPh3 top-left, Br top-right, Br bottom-left, PPh3 bottom-right; and octahedral Co with H3N (top-left), NO2 (top), NO2 (top-right), H3N (bottom-left), NH3 (bottom), NO2 (bottom-right)]
  4. (4)[figure: square planar Ni with both PPh3 on the left and both Br on the right; and octahedral Co with O2N (top-left), NH3 (top), NH3 (top-right), O2N (bottom-left), NH3 (bottom), NO2 (bottom-right)]

Official answer

Option 2

NTA final key.

Chapter
Coordination Compounds
Topic
Coordination Isomerism
Idea tested
Square Planar Geometry

Same idea in other shifts

Asked 3× in all
  1. 11 Apr 2023, Shift 2 · Q72If Ni2+\mathrm{Ni^{2+}} is replaced by Pt2+\mathrm{Pt^{2+}} in the complex [NiCl2Br2]2−\mathrm{[NiCl_2Br_2]^{2-}}, which of the following properties are…MediumSingle correct
  2. 8 Jan 2020, Shift 2 · Q38Among (a) – (d), the complexes that can display geometrical isomerism are : (a) [Pt(NH3)3Cl]+\mathrm{[Pt(NH_3)_3Cl]^+} (b)…MediumSingle 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.