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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyMulti-step

JEE Main 17 March 2021, Shift 1, Chemistry Q46

Question 46 of 90 in this shift, Chemistry question 16 of 30, Section A.

Hoffmann bromomide degradation of benzamide gives product A, which upon heating with CHCl3\mathrm{CHCl_3} and NaOH gives product B. The structures of A and B are :

The figure, in words

All four options are pairs of drawn benzene structures labelled A and B, described in the options.
  1. (1)[figure: A - benzene ring with CONH2 (C double bonded to O, attached to NH2) and Br at the para position; B - benzene ring with CONH2, an adjacent CHO and Br]
  2. (2)[figure: A - benzene ring bearing NH2; B - benzene ring bearing NC]Official answer
  3. (3)[figure: A - benzene ring with NH2 and Br at the para position; B - benzene ring with NH2, an adjacent CHO and Br]
  4. (4)[figure: A - benzene ring bearing NH2; B - benzene ring bearing NH2 and an adjacent CHO]

Official answer

Option 2

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. 30 Jan 2024, Shift 1 · Q77The final product A, formed in the following multistep reaction sequence is : [Scheme: bromobenzene…MediumDiagram basedHas a figure
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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

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.