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Friday, 9 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumApplication

JEE Main 8 April 2024, Shift 1, Chemistry Q90

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

Number of amine compounds from the following giving solids which are soluble in NaOH upon reaction with Hinsberg's reagent is __________. [figure: eleven structures: aniline; benzamide (C6H5CONH2\mathrm{C_6H_5CONH_2}); H2NNH−C(=O)−NH2\mathrm{H_2NNH-C(=O)-NH_2}; N-methylaniline (C6H5NHCH3\mathrm{C_6H_5NHCH_3}); diarylamine-type (C6H5−NH−\mathrm{C_6H_5-NH-} six-membered ring −NH2-\mathrm{NH_2}); H2N−C(=O)−NH2\mathrm{H_2N-C(=O)-NH_2}; 2-methoxyaniline; propylamine (CH3CH2CH2NH2\mathrm{CH_3CH_2CH_2NH_2}); triethylamine; tertiary amine (N\mathrm{N} bearing ethyl, methyl and cyclohexylmethyl); cyclohexylamine]

The figure, in words

Eleven structures drawn in three rows: aniline, benzamide, semicarbazide-type H2NNH-CO-NH2, N-methylaniline; then diarylamine-type (C6H5-NH-ring-NH2), urea, 2-methoxyaniline, n-propylamine; then triethylamine, an N-ethyl N-(cyclohexylmethyl) tertiary amine, cyclohexylamine.

Official answer

5

NTA final key.

Chapter
Amines
Topic
Amines
Idea tested
Hinsberg Test

Same idea in other shifts

Asked 3× in all
  1. 6 Apr 2023, Shift 1 · Q73Compound P (M.F. C14H13ON\mathrm{C_{14}H_{13}ON}; M.F. = MOLECULAR FORMULA) on treatment with HCl, Δ\Delta gives a Filter step: Residue Q and…HardDiagram basedHas a figure
  2. 25 Jul 2021, Shift 1 · Q46Which one of the products of the following reactions does not react with Hinsberg reagent to form sulphonamide ?MediumSingle correctHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.