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Friday, 9 October

NEET UG 2017 · Chemistry · Question 61

NEET 2017 Chemistry, question 61

Question 61 of the NEET 2017 paper (code A) is a Chemistry question from Aldehydes, Ketones and Carboxylic Acids. Its idea, Acetaldehyde Self-Condensation (Crotonaldehyde), was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 3.

Updated 2026-10-08

Q61 · Chemistry

Consider the reactions :

X (C2H6O\mathrm{C_2H_6O}) →Cu/573 K\xrightarrow{Cu/573\ K} A; A →[Ag(NH3)2]+, −OH, Δ\xrightarrow{[Ag(NH_3)_2]^+,\ ^-OH,\ \Delta} Silver mirror observed; A →−OH, Δ\xrightarrow{^-OH,\ \Delta} Y; A →NH2−NH−C(=O)−NH2\xrightarrow{NH_2-NH-C(=O)-NH_2} Z

Identify A, X, Y and Z

The figure, described in words

Reaction scheme: X (C2H6O) with Cu/573 K gives A; A with Tollens' reagent [Ag(NH3)2]+/OH-/heat gives silver mirror; A with OH-/heat gives Y; A with semicarbazide NH2-NH-CO-NH2 gives Z.

  1. 1A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine.
  2. 2A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.
  3. 3A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.Official answer
  4. 4A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone.

Official answer: option 3 · CBSE official answer key

Same idea

The only question on Acetaldehyde Self-Condensation (Crotonaldehyde)

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

Acetaldehyde Self-Condensation (Crotonaldehyde): 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