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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 9 April 2024, Shift 1, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

Identify major product "X" formed in the following reaction : [figure: benzene →Anhydrous AlCl3/CuClCO, HCl\xrightarrow[\mathrm{Anhydrous\ AlCl_3/CuCl}]{\mathrm{CO,\ HCl}} X (Major Product)]

The figure, in words

Benzene with CO, HCl, anhydrous AlCl3/CuCl gives X (Gattermann-Koch). Options are structures.
  1. (1)[figure: benzoyl chloride, C6H5COCl\mathrm{C_6H_5COCl}]
  2. (2)[figure: benzyl chloride, C6H5CH2Cl\mathrm{C_6H_5CH_2Cl}]
  3. (3)[figure: benzaldehyde, C6H5CHO\mathrm{C_6H_5CHO}]Official answer
  4. (4)[figure: benzophenone, C6H5COC6H5\mathrm{C_6H_5COC_6H_5}]

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. 31 Jan 2024, Shift 2 · Q78Identify the name reaction. [reaction: benzene + CO, HCl --(anhydrous AlCl3_3/CuCl)--> benzaldehyde (C6_6H5_5CHO)]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.