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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 31 August 2021, Shift 1, Chemistry Q47

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

The structure of product C, formed by the following sequence of reactions is : \mathrm{CH_3COOH + SOCl_2} \longrightarrow \mathrm{A} \xrightarrow[\mathrm{AlCl_3}]{\text{Benzene}} \mathrm{B} \xrightarrow[{}^{-}\mathrm{OH}]{\mathrm{KCN}} \mathrm{C}

The figure, in words

Reaction scheme is printed text; options are drawn benzene-ring structures.
  1. (1)[structure as drawn: benzene ring bonded to a central C carrying H, COOH and CH3]
  2. (2)[structure as drawn: benzene ring bonded to a central C carrying NC, OH and CH3]Official answer
  3. (3)[structure as drawn: benzene ring bonded to CH2 – CH2CN]
  4. (4)[structure as drawn: benzene ring with, on two adjacent ring carbons, a C(=O)CH3 group (O above C, CH3 to the right) and a CN group]

Official answer

Option 2

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Cyanohydrin Formation

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2024, Shift 2 · Q78Consider the given reaction, identify the major product P. CH3−COOH\mathrm{CH_3-COOH}…MediumSingle correct

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.