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Saturday, 31 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 idea in other shifts

Asked 2× in all
  1. 22 Jul 2021, Shift 2 · Q44Which one of the following molecules does not show stereo isomerism ?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.