Learn

Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 3 August 2021, Shift 2, Chemistry Q44

Question 44 of 90 in this shift, Chemistry question 14 of 30, Section A.

The correct structure of ciscis–2,4-dimethylhept-3-ene is,

The figure, in words

Options are four skeletal alkene structures drawn with C=C.
  1. (1)[figure: C=C with (CH3)2CH– and H on the left carbon (CH3)2CH– on top, H below; CH3 on top and CH2CH2CH3 below on the right carbon]
  2. (2)[figure: C=C with H on top and (CH3)2CH– below on the left carbon; CH3 on top and CH2CH2CH3 below on the right carbon]Official answer
  3. (3)[figure: C=C with (CH3)2CH– on top and CH3 below on the left carbon; H on top and CH2CH2CH3 below on the right carbon]
  4. (4)[figure: C=C with CH3CH2– on top and (CH3)2CH– below on the left carbon; H on top and CH2CH3 below on the right carbon]

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Stereoisomerism
Idea tested
Geometrical Isomerism

Same topic in other shifts

All Stereoisomerism questions
  1. 4 Apr 2026, Shift 2 · Q65The following structures are [figure: stereocentre C with Br (up), CH3 (hashed, left), Me (down), Cl (wedge, right)] and [figure:…EasyDiagram basedHas a figure
  2. 7 Apr 2025, Shift 2 · Q65Given below are two statements : Statement (I) : [figure: cis-1,2-dichloroethene] is more polar than [figure: cis-1,2-dibromoethene].…MediumTwo statementsHas a figure
  3. 6 Apr 2024, Shift 2 · Q75The incorrect statement regarding the geometrical isomers of 2-butene is :EasySingle correct
  4. 8 Apr 2024, Shift 1 · Q88The number of optical isomers in following compound is:__________ [figure: three fused cyclohexane rings in a linear (anthracene-type)…HardNumerical valueHas a figure
  5. 9 Apr 2024, Shift 2 · Q76Total number of stereo isomers possible for the given structure :MediumSingle correctHas a figure
  6. 30 Jan 2024, Shift 2 · Q87Number. of geometrical isomers possible for the given structure is/are ________.MediumNumerical 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 42 of the 174 JEE Main shifts held from 2017 to 2026.