NEET UG 2026 · Chemistry · Question 82
NEET 2026 Chemistry, question 82
Question 82 of the NEET 2026 paper (re-exam) is a Chemistry question from Aldehydes, Ketones and Carboxylic Acids. Its idea, Claisen-Schmidt Condensation, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q82 · Chemistry
The compound that CANNOT be obtained from the aldol condensation reaction shown below, is
[2,2-dimethylcyclopentan-1-one] + PhCHO
The figure, described in words
Reactant 2,2-dimethylcyclopentanone and all four options drawn as skeletal structures.
- 1[2,2-dimethylcyclopentanone bearing at C5 a 5,5-dimethylcyclopent-1-en-1-yl group (single bond to the ring)]Official answer
- 2[5-benzylidene-2,2-dimethylcyclopentanone (C=CH–Ph, Ph drawn on one side)]
- 3[2,2-dimethylcyclopentanone with C5=C double bond to a 2,2-dimethylcyclopentylidene ring]
- 4[5-benzylidene-2,2-dimethylcyclopentanone (C=CH–Ph, Ph drawn on the other side, geometric isomer of option 2)]
Official answer: option 1 · NTA final answer key
Same idea
The only question on Claisen-Schmidt Condensation
No other NEET paper from 2017–2026 tested this exact idea.
Claisen-Schmidt Condensation: every question and how it was framed
The chapter
Aldehydes, Ketones and Carboxylic Acids in ten years of NEET
27 questions from 2017–2026, asked in 10 of 10 papers, about 2.6 a paper. Aldol Condensation alone had 5.