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Saturday, 31 October

JEE Main · Chemistry · Coordination Compounds

Total Isomer Calculation

JEE Main asked Total Isomer Calculation 3 times in 3 of the 108 shifts Lumi analysed, in 2021, 2022 and 2023. It belongs to Coordination Isomerism, in Coordination Compounds (Chemistry). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
3 of 8
First asked
2021
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200.03’210.03’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20221 of 24
  • 20211 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: multi-step.

  • Count stereoisomers of chelate complex
  • Count cis-trans isomers in cobalt ammine chloride

Difficulty

Easy 0Medium 2Hard 1

2 of the 3 questions had a numerical answer.

Every question

All 3 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 13 Apr 2023, Shift 2 · Q72The total number of stereoisomers for the complex [Cr(ox)2ClBr]3−[\mathrm{Cr}(ox)_2\mathrm{ClBr}]^{3-} (where oxox = oxalate) is:MediumSingle correct
  2. 28 Jun 2022, Shift 2 · Q87(a) CoCl3.4 NH3\mathrm{CoCl_3.4\ NH_3}, (b) CoCl3⋅5NH3\mathrm{CoCl_3\cdot5NH_3}, (c) CoCl3⋅6NH3\mathrm{CoCl_3\cdot6NH_3} and (d) CoCl(NO3)2⋅5NH3\mathrm{CoCl(NO_3)_2\cdot5NH_3}.…MediumNumerical value
  3. 26 Feb 2021, Shift 2 · Q60The number of stereoisomers possible for [Co(ox)2(Br)(NH3)]2−[\mathrm{Co(ox)_2(Br)(NH_3)}]^{2-} is __________. [ox = oxalate]HardNumerical value

Shifts: 26 Feb 2021, Shift 2, 28 Jun 2022, Shift 2, 13 Apr 2023, Shift 2.

Same topic

Other ideas in Coordination Isomerism

Coordination Isomerism has 20 ideas JEE Main has asked; 8 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas