JEE Main 2026 · ChemistryMultiple choiceDiagram basedHardConceptual

JEE Main 4 April 2026, Shift 2, Chemistry Q61

Question 61 of 75 in this shift, Chemistry question 11 of 25, Section A.

Consider the following molecules/species: (x) cycloheptatrienone (tropone): a seven-membered ring with three C=C double bonds and an exocyclic C=O (y)

\mathrm{(CH_3)_2C=O}

(propanone) (z)

\mathrm{CH_3-C(=O)-O^{(-)}}

(acetate ion) The correct order of carbon - oxygen double bond length is :

The figure, in words

Structures labelled (x) seven-membered ring ketone with three ring C=C (tropone), (y) acetone with two CH3 on the C=O carbon, (z) acetate ion CH3-C(=O)-O(-).

(1) $x>y>z$
(2) $y>z>x$
(3) $z>x>y$
(4) $x>z>y$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Organic Chemistry: Some Basic Principles and Techniques
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy