Learn

Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 17 March 2021, Shift 1, Chemistry Q47

Question 47 of 90 in this shift, Chemistry question 17 of 30, Section A.

[reaction drawn: see figure_note] The product “A” in the above reaction is :

The figure, in words

Reactant drawn: CH3-C(=O)-CH2-C(=O)-OC2H5 (two C=O drawn, skeletal), arrow with Ethylene Glycol above and H+ below; product labelled A (Major Product).
  1. (1)[figure: carbon bearing a chain O-CH2-CH2-OH and an OH group, a CH3, and a CH2 linked to C(=O)OC2H5]
  2. (2)[figure: five-membered ring containing two O atoms attached to one carbon (that carbon also bears a CH3 and a CH2 linked to C(=O)OH)]
  3. (3)[figure: four-membered ring (square) with C=O at upper-left vertex; lower-right vertex bears OC2H5 and OH]
  4. (4)[figure: five-membered ring containing two O atoms attached to one carbon (that carbon also bears a CH3 and a CH2 linked to C(=O)OC2H5)]Official answer

Official answer

Option 4

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Cyclic Acetal Protection

Same topic in other shifts

All Nucleophilic Addition questions
  1. 2 Apr 2026, Shift 2 · Q67A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q66Given below are two statements : Statement I : The condensation reaction between CH3−CH=O\mathrm{CH_3-CH=O} and H2N−NH−C(=O)−NH2\mathrm{H_2N-NH-C(=O)-NH_2}…MediumTwo statements
  3. 7 Apr 2025, Shift 2 · Q68"P" is an optically active compound with molecular formula C6H12O\mathrm{C_6H_{12}O}. When 'P' is treated with 2, 4-dinitrophenylhydrazine, it…MediumDiagram basedHas a figure
  4. 6 Apr 2024, Shift 1 · Q79Which among the following aldehydes is most reactive towards nucleophilic addition reactions?EasySingle correctHas a figure
  5. 6 Apr 2024, Shift 2 · Q78Consider the given reaction, identify the major product P. CH3−COOH\mathrm{CH_3-COOH}…MediumSingle correct
  6. 30 Jan 2024, Shift 1 · Q90The compound formed by the reaction of ethanal with semicarbazide contains ________ number of nitrogen atoms.EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.