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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 30 January 2024, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

The final product A, formed in the following multistep reaction sequence is : [Scheme: bromobenzene →(i) Mg, ether then CO2,H+; (ii) NH3,Δ; (iii) Br2,NaOH\xrightarrow{\text{(i) Mg, ether then }\mathrm{CO_2, H^+};\ \text{(ii) }\mathrm{NH_3, \Delta};\ \text{(iii) }\mathrm{Br_2, NaOH}} A]

The figure, in words

Reaction scheme starting from bromobenzene (benzene ring with Br) with three steps (i) Mg, ether then CO2, H+ (ii) NH3, heat (iii) Br2, NaOH giving A. Options are drawn benzene derivatives.
  1. (1)[figure: benzamide, benzene ring bearing C(=O)NH2]
  2. (2)[figure: benzoic acid, benzene ring bearing C(=O)OH]
  3. (3)[figure: benzoyl bromide, benzene ring bearing C(=O)Br]
  4. (4)[figure: aniline, benzene ring bearing NH2]Official answer

Official answer

Option 4

NTA final key.

Chapter
Amines
Topic
Amines
Idea tested
Hofmann Bromamide Degradation

Same idea in other shifts

Asked 11× in all
  1. 5 Apr 2026, Shift 2 · Q67Given below are two statements : Statement I : Heating benzamide with bromine in an ethanolic solution of sodium hydroxide will give…MediumTwo statements
  2. 8 Apr 2026, Shift 2 · Q68Which statements are True ? A. In Hoffmann bromamide degradation, 4 moles of NaOH and 2 moles of Br2\mathrm{Br_2} are consumed per mole of…MediumOther
  3. 6 Apr 2023, Shift 1 · Q76The major product formed in the following reaction is [Reactant: benzene ring bearing ortho CH2CONH2\mathrm{CH_2CONH_2} and COOCH3\mathrm{COOCH_3}…HardDiagram basedHas a figure
  4. 29 Jul 2022, Shift 1 · Q76[figure: 'A' (C8H6Cl2O\mathrm{C_8H_6Cl_2O}) →NH3\xrightarrow{\mathrm{NH_3}} C8H8ClNO\mathrm{C_8H_8ClNO} →NaOHBr2\xrightarrow[\mathrm{NaOH}]{\mathrm{Br_2}} a…HardDiagram basedHas a figure
  5. 30 Jul 2022, Shift 2 · Q46Which one of the following compounds can be prepared in good yield by Hoffmann bromamide degradation reaction?EasyDiagram basedHas a figure
  6. 25 Jun 2022, Shift 1 · Q78The reaction of R−C(=O)−NH2\mathrm{R-C(=O)-NH_2} with bromine and KOH gives RNH2\mathrm{RNH_2} as the end product. Which one of the following is the…EasySingle correct
  7. 27 Jun 2022, Shift 1 · Q77Given below are two statements : Statement - I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from…MediumTwo statements
  8. 27 Aug 2021, Shift 1 · Q46The major product of the following reaction is : CH3−CH−CH2−CH2−C(=O)−Cl\mathrm{CH_3-CH-CH_2-CH_2-C(=O)-Cl} [CH3 drawn above the CH, O drawn above the C]…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.