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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 27 August 2021, Shift 1, Chemistry Q46

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

The 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] →(i) alcoholic NH3; (ii) NaOH, Br2; (iii) NaNO2, HCl; (iv) H2O\xrightarrow{\text{(i) alcoholic }\mathrm{NH_3};\ \text{(ii) NaOH, }\mathrm{Br_2};\ \text{(iii) }\mathrm{NaNO_2}\text{, HCl};\ \text{(iv) }\mathrm{H_2O}} Major Product

The figure, in words

Reactant and options are drawn as condensed structures with the CH3 branch drawn above (reactant) or below (options) the CH, and the C(=O)-Cl group with O drawn above the C. Reagent list printed as (i) alcoholic NH3 (ii) NaOH, Br2 (iii) NaNO2, HCl (iv) H2O.
  1. (1)CH3−CH−CH2−CH2OH\mathrm{CH_3-CH-CH_2-CH_2OH} with CH3\mathrm{CH_3} drawn below the CHOfficial answer
  2. (2)CH3−CH−CH−CH2OH\mathrm{CH_3-CH-CH-CH_2OH} with CH3\mathrm{CH_3} drawn below the first CH and Br drawn above the second CH
  3. (3)CH3−CH−CH2−CH2−Cl\mathrm{CH_3-CH-CH_2-CH_2-Cl} with CH3\mathrm{CH_3} drawn below the CH
  4. (4)CH3−CH−CH2−CH2−CH2OH\mathrm{CH_3-CH-CH_2-CH_2-CH_2OH} with CH3\mathrm{CH_3} drawn below the CH

Official answer

Option 1

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.