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Friday, 9 October

NEET UG 2017 · Chemistry · Question 57

NEET 2017 Chemistry, question 57

Question 57 of the NEET 2017 paper (code A) is a Chemistry question from Hydrocarbons. Its idea, Hydration and Keto-Enol Tautomerism, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 4.

Updated 2026-10-08

Q57 · Chemistry

Predict the correct intermediate and product in the following reaction

H3C−C≡CH→HgSO4H2O, H2SO4\mathrm{H_3C-C\equiv CH \xrightarrow[HgSO_4]{H_2O,\ H_2SO_4}} intermediate (A) →\to product (B)

The figure, described in words

Stem reaction scheme (propyne with H2O, H2SO4/HgSO4 -> intermediate A -> product B) and options giving A and B as drawn structural formulas with vertical bonds (OH, SO4, C=O branches).

  1. 1A : H3C−C(SO4)=CH2\mathrm{H_3C-C(SO_4)=CH_2} B : H3C−C(=O)−CH3\mathrm{H_3C-C(=O)-CH_3}
  2. 2A : H3C−C(OH)=CH2\mathrm{H_3C-C(OH)=CH_2} B : H3C−C(SO4)=CH2\mathrm{H_3C-C(SO_4)=CH_2}
  3. 3A : H3C−C(=O)−CH3\mathrm{H_3C-C(=O)-CH_3} B : H3C−C≡CH\mathrm{H_3C-C\equiv CH}
  4. 4A : H3C−C(OH)=CH2\mathrm{H_3C-C(OH)=CH_2} B : H3C−C(=O)−CH3\mathrm{H_3C-C(=O)-CH_3}Official answer

Official answer: option 4 · CBSE official answer key

Same idea

The only question on Hydration and Keto-Enol Tautomerism

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

Hydration and Keto-Enol Tautomerism: every question and how it was framed

The chapter

Hydrocarbons in ten years of NEET

25 questions from 2017–2026, asked in 10 of 10 papers, about 2.4 a paper. Hydrocarbons (Alkynes) alone had 4.

Chapter analysisStudy this chapterPractise this chapter

Hydrocarbons: questions per paper

0363’171’182’192’204’212’222’231’245’253’26