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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 30 June 2022, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

Consider the given chemical reaction [structure: a six-membered saturated carbon ring bearing a C(=O)OH group (carbonyl O drawn above the carbon, OH to its right)] →(ii) H2O(i) Red P, Cl2\xrightarrow[\text{(ii) } \mathrm{H_2O}]{\text{(i) Red P, } \mathrm{Cl_2}} P (Major Product) Identify the product P.

The figure, in words

Reactant: cyclic six-membered carbon ring with a C(=O)OH substituent; reagents (i) Red P, Cl2 (ii) H2O over arrow to P, Major Product. Options are drawn ring structures.
  1. (1)[figure: six-membered saturated carbon ring with Cl and C(=O)OH both attached to the same ring carbon]Official answer
  2. (2)[figure: six-membered saturated carbon ring with a C(=O)Cl group attached]
  3. (3)[figure: six-membered saturated carbon ring with C(=O)OH on one ring carbon and Cl on a ring carbon separated from it by one ring carbon]
  4. (4)[figure: six-membered saturated carbon ring with C(=O)OH on one ring carbon and Cl on the opposite ring carbon]

Official answer

Option 1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Carboxylic Acids and Derivatives
Idea tested
Hell-Volhard-Zelinsky Reaction

Same idea in other shifts

Asked 4× in all
  1. 8 Apr 2024, Shift 1 · Q79Identify the product (P) in the following reaction: [figure: cyclopentanecarboxylic acid]…EasyDiagram basedHas a figure
  2. 6 Apr 2023, Shift 1 · Q77Match List I with List II LIST I (Name of reaction) | LIST II (Reagent used) A. Hell-Volhard-Zelinsky reaction | I. NaOH+I2\mathrm{NaOH + I_2}…MediumMatch the list
  3. 4 Aug 2021, Shift 1 · Q44Identify the reagent in the following reaction. CH3−CH2−C(=O)−OH→ReagentCH3−CH(X)−C(=O)−OH\mathrm{CH_3-CH_2-C(=O)-OH \xrightarrow{Reagent} CH_3-CH(X)-C(=O)-OH} (X = Cl, – Br)EasySingle correctHas a figure

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.