NEET UG 2018 · Chemistry · Question 64
NEET 2018 Chemistry, question 64
Question 64 of the NEET 2018 paper (code AA) is a Chemistry question from Organic Chemistry - Some Basic Principles and Techniques. Its idea, Arenium Ion (Wheland Intermediate) Stability, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 1.
Updated 2026-10-08
Q64 · Chemistry
Which of the following carbocations is expected to be most stable ?
The figure, described in words
Four drawn cyclohexadienyl (arenium) cations bearing NO2 and an sp3 C(H)(Y); they differ in where the + charge sits relative to the C–NO2 carbon.
- 1[structure: arenium (cyclohexadienyl) cation with on C1, sp C(H)(Y) meta to C1, positive charge on the carbon para to C1]Official answer
- 2[structure: arenium cation with positive charge on the carbon bearing , sp C(Y)(H) para to it]
- 3[structure: arenium cation with on C1, sp C(Y)(H) para to C1, positive charge on a carbon meta to C1]
- 4[structure: arenium cation with positive charge on the carbon bearing , sp C(H)(Y) ortho (adjacent) to it]
Official answer: option 1 · CBSE official answer key
Same idea
The only question on Arenium Ion (Wheland Intermediate) Stability
No other NEET paper from 2017–2026 tested this exact idea.
Arenium Ion (Wheland Intermediate) Stability: every question and how it was framed
The chapter
Organic Chemistry - Some Basic Principles and Techniques in ten years of NEET
22 questions from 2017–2026, asked in 10 of 10 papers, about 2.1 a paper. Resonance and Mesomerism alone had 2.