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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 4 April 2024, Shift 1, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

The number of the correct reaction(s) among the following is ________. (A) [benzene + benzoyl chloride (C6H5COCl\mathrm{C_6H_5COCl}), Anhyd.AlCl3\mathrm{AlCl_3} →\rightarrow diphenylmethane (C6H5−CH2−C6H5\mathrm{C_6H_5{-}CH_2{-}C_6H_5})] (B) [benzoyl chloride, H2\mathrm{H_2}, Pd−BaSO4\mathrm{Pd-BaSO_4} →\rightarrow benzoic acid (C6H5COOH\mathrm{C_6H_5COOH})] (C) [benzene, CO,HCl, Anhyd.AlCl3\mathrm{AlCl_3}/CuCl →\rightarrow benzaldehyde (C6H5CHO\mathrm{C_6H_5CHO})] (D) [benzamide (C6H5CONH2\mathrm{C_6H_5CONH_2}), H3O+\mathrm{H_3O^+}, Δ\Delta →\rightarrow aniline (C6H5NH2\mathrm{C_6H_5NH_2})]

The figure, in words

Four reactions drawn with benzene rings: (A) benzene + benzoyl chloride, Anhyd.AlCl3 -> product drawn as two phenyl rings joined by CH2; (B) benzoyl chloride, H2 / Pd-BaSO4 -> product drawn as phenyl-COOH; (C) benzene, CO,HCl, Anhyd.AlCl3/CuCl -> phenyl-CHO; (D) phenyl-CONH2, H3O+ / heat -> phenyl-NH2.

Official answer

1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aromatic Hydrocarbons
Idea tested
Friedel-Crafts Acylation and Acylium Ion

Same idea in other shifts

Asked 4× in all
  1. 5 Apr 2024, Shift 2 · Q75Identify A and B in the given chemical reaction sequence : Benzene + succinic anhydride (cyclic five-membered anhydride)…MediumDiagram basedHas a figure
  2. 31 Jan 2024, Shift 2 · Q77Identify major product 'P' formed in the following reaction. [reaction: benzene + benzoyl chloride (C6_6H5_5COCl) --(Anhydrous…EasyDiagram basedHas a figure
  3. 31 Aug 2021, Shift 2 · Q45The structures of A and B formed in the following reaction are : [Ph = −C6H5-\mathrm{C_6H_5}] [benzene ring (with inner circle) + a…MediumDiagram basedHas 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.