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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 31 January 2024, Shift 2, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

Identify the name reaction. [reaction: benzene + CO, HCl --(anhydrous AlCl3_3/CuCl)--> benzaldehyde (C6_6H5_5CHO)]

The figure, in words

Reaction scheme: benzene treated with CO, HCl and anhydrous AlCl3/CuCl gives benzaldehyde.
  1. (1)Etard Reaction
  2. (2)Stephen Reaction
  3. (3)Gatterman - Koch ReactionOfficial answer
  4. (4)Rosenmund Reduction

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aromatic Hydrocarbons
Idea tested
Gattermann-Koch Formylation

Same idea in other shifts

Asked 4× in all
  1. 8 Apr 2026, Shift 2 · Q72'xx' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous…MediumNumerical value
  2. 9 Apr 2024, Shift 1 · Q75Identify major product "X" formed in the following reaction : [figure: benzene…EasySingle correctHas a figure
  3. 3 Aug 2021, Shift 2 · Q46Which one of the following reagents are not suitable for the preparation of benzaldehyde from benzene?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 42 of the 174 JEE Main shifts held from 2017 to 2026.