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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceTwo statementsMediumConceptual

JEE Main 29 July 2022, Shift 2, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

Given below are two statements. Statement I: The compound [figure: compound (A), a drawn structure with a stereocentre bearing NO2\mathrm{NO_2} (bold wedge), H (hashed), a CH=CH−CH3\mathrm{CH{=}CH{-}CH_3} chain on one side and a CH=CH−CH3\mathrm{CH{=}CH{-}CH_3} chain on the other] is optically active. Statement II: [figure: structure with O2N\mathrm{O_2N} (bold wedge), H (hashed) and two CH=CH−CH3\mathrm{CH{=}CH{-}CH_3} chains] is mirror image of above compound A. In the light of the above statement, choose the most appropriate answer from the options given below.

The figure, in words

Statement I shows compound (A): a central carbon with NO2 on a bold wedge, H on a hashed bond, and two propenyl arms ending in CH3. Statement II shows a drawn structure with O2N on a bold wedge, H hashed and two propenyl arms ending in CH3, claimed to be the mirror image of A.
  1. (1)Both Statement I and Statement II are correct.
  2. (2)Both Statement I and Statement II are incorrect.
  3. (3)Statement I is correct but Statement II is incorrect.Official answer
  4. (4)Statement I is incorrect but Statement II is correct.

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Stereoisomerism
Idea tested
Chiral Centers

Same idea in other shifts

Asked 12× in all
  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. 8 Apr 2024, Shift 2 · Q89Total number of optically active compounds from the following is ___________. (1) Fischer projection: CH3\mathrm{CH_3} on top; H-C-OH;…MediumNumerical valueHas a figure
  3. 1 Feb 2024, Shift 1 · Q89Number of optical isomers possible for 2-chlorobutane ________.EasyNumerical value
  4. 11 Apr 2023, Shift 2 · Q79Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A solution of the…MediumAssertion–reason
  5. 29 Jun 2022, Shift 1 · Q89Observe structures of the following compounds [figure: five structures] The total number of structures/compounds which possess asymmetric…EasyNumerical valueHas a figure
  6. 29 Jun 2022, Shift 2 · Q88The number of chiral alcohol(s) with molecular formula C4H10O\mathrm{C_4H_{10}O} is _____.MediumNumerical value
  7. 8 Jan 2020, Shift 1 · Q50The number of chiral centres in penicillin is ______.MediumNumerical value
  8. 2 Sep 2020, Shift 1 · Q50The number of chiral carbons present in the molecule given below is ______.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 108 of the 174 JEE Main shifts held from 2017 to 2026.