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Friday, 9 October

NEET UG 2022 · Chemistry · Question 90

NEET 2022 Chemistry, question 90

Question 90 of the NEET 2022 paper (code R1) is a Chemistry question from Aldehydes, Ketones and Carboxylic Acids. Its idea, Cross-Aldol Reaction Selectivity, was asked twice, in 2020 and 2022, across NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q90 · Chemistry

Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating ?

The figure, described in words

Four α,β-unsaturated ketone structures drawn as skeletal formulae.

  1. 1[structure: CH3COC(C2H5)=C(CH3)2\mathrm{CH_3COC(C_2H_5)=C(CH_3)_2}]
  2. 2[structure: CH3COCH=C(CH3)2\mathrm{CH_3COCH=C(CH_3)_2}]
  3. 3[structure: CH3CH2COC(CH3)=C(C2H5)2\mathrm{CH_3CH_2COC(CH_3)=C(C_2H_5)_2}]Official answer
  4. 4[structure: CH3CH2CH2C(CH3)=CHCOCH3\mathrm{CH_3CH_2CH_2C(CH_3)=CHCOCH_3}]

Official answer: option 3 · NTA final answer key

Same idea

Cross-Aldol Reaction Selectivity, in other papers

NEET asked this idea twice, in 2020 and 2022. The other question below.

  • 2020 Q107Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as :One-line MCQ · Easy

Cross-Aldol Reaction Selectivity: 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.

Chapter analysisStudy this chapterPractise this chapter

Aldehydes, Ketones and Carboxylic Acids: questions per paper

0242’171’181’192’204’214’223’234’243’253’26