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Saturday, 10 October

NEET UG 2021 · Chemistry · Question 87

NEET 2021 Chemistry, question 87

Question 87 of the NEET 2021 paper (code O1) is a Chemistry question from Aldehydes, Ketones and Carboxylic Acids. Its idea, Etard Reaction, was asked twice, in 2021 and 2026, across NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q87 · Chemistry

The intermediate compound 'X' in the following chemical reaction is :

C6H5CH3+CrO2Cl2→CS2X→H3O+C6H5CHO\mathrm{C_6H_5CH_3 + CrO_2Cl_2 \xrightarrow{CS_2} X \xrightarrow{H_3O^{+}} C_6H_5CHO}

The figure, described in words

Benzene-ring structures: toluene + CrO2Cl2 (CS2) gives X, which with H3O+ gives benzaldehyde; options are benzene rings with the substituents shown.

  1. 1C6H5CHCl2\mathrm{C_6H_5CHCl_2}
  2. 2C6H5CH2Cl\mathrm{C_6H_5CH_2Cl}
  3. 3C6H5CH(OCrOHCl2)2\mathrm{C_6H_5CH(OCrOHCl_2)_2}Official answer
  4. 4C6H5CH(OCOCH3)2\mathrm{C_6H_5CH(OCOCH_3)_2}

Official answer: option 3 · NTA final answer key

Same idea

Etard Reaction, in other papers

NEET asked this idea twice, in 2021 and 2026. The other question below.

  • 2026 Q86Consider the following reaction, and choose the correct option. C6H5CH3\mathrm{C_6H_5CH_3}…One-line MCQ · Medium

Etard Reaction: 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. Aldehydes, Ketones and Carboxylic Acids alone had 22.

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