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Friday, 9 October

NEET UG 2021 · Chemistry · Question 84

NEET 2021 Chemistry, question 84

Question 84 of the NEET 2021 paper (code O1) is a Chemistry question from Amines. Its idea, Alkali Solubility in the Hinsberg Test, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.

Updated 2026-10-08

Q84 · Chemistry

Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

The figure, described in words

Options: four drawn structural formulas of amines/nitro compound (CH3CH2NH2, tertiary amine, CH3CH2NO2, secondary amine with lone pairs) for Hinsberg test.

  1. 1CH3−CH2−N¨H2\mathrm{CH_3-CH_2-\ddot{N}H_2}Official answer
  2. 2CH3−CH2−N¨(CH3)−CH2−CH3\mathrm{CH_3-CH_2-\ddot{N}(CH_3)-CH_2-CH_3}
  3. 3CH3−CH2−N¨O2\mathrm{CH_3-CH_2-\ddot{N}O_2}
  4. 4CH3−CH2−N¨H−CH3\mathrm{CH_3-CH_2-\ddot{N}H-CH_3}

Official answer: option 1 · NTA final answer key

Same idea

The only question on Alkali Solubility in the Hinsberg Test

No other NEET paper from 2017–2026 tested this exact idea.

Alkali Solubility in the Hinsberg Test: every question and how it was framed

The chapter

Amines in ten years of NEET

18 questions from 2017–2026, asked in 10 of 10 papers, about 1.7 a paper. Amines and Diazonium Salts alone had 18.

Chapter analysisStudy this chapterPractise this chapter

Amines: questions per paper

0242’171’181’191’202’212’222’232’243’252’26