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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 25 February 2021, Shift 2, Chemistry Q48

Question 48 of 90 in this shift, Chemistry question 18 of 30, Section A.

Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline ?

The figure, in words

Each option is a benzene ring (circle in hexagon) with a single substituent as written in the option.
  1. (1)[figure: benzene ring bearing NHCH3\mathrm{NHCH_3}]
  2. (2)[figure: benzene ring bearing CN\mathrm{CN}]
  3. (3)[figure: benzene ring bearing NC\mathrm{NC}]Official answer
  4. (4)[figure: benzene ring bearing CONH2\mathrm{CONH_2}]

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Amines
Idea tested
Carbylamine Reaction

Same idea in other shifts

Asked 7× in all
  1. 2 Apr 2026, Shift 1 · Q67Match List - I with List - II. List - I (Mixture of Compounds) : A. Diethyl amine + Ethyl amine B. Acetaldehyde + Acetone C. Ethanol +…MediumMatch the list
  2. 5 Apr 2026, Shift 1 · Q66Benzyl isocyanide can be obtained from A. [figure: benzyl bromide, C6H5CH2Br\mathrm{C_6H_5CH_2Br}] →AgCN\xrightarrow{\mathrm{AgCN}} B. [figure:…MediumOtherHas a figure
  3. 7 Apr 2025, Shift 1 · Q69Which of the following amine (s) show (s) positive carbylamine test? A. [aniline: benzene ring bearing NH2\mathrm{NH_2}] B.…EasyOtherHas a figure
  4. 3 Aug 2021, Shift 2 · Q60The number of isomers with molecular formula C3H9N\mathrm{C_3H_9N}, which will react with CHCl3+KOH\mathrm{CHCl_3 + KOH} is…MediumNumerical value
  5. 4 Aug 2021, Shift 1 · Q60Number of isomeric compounds with molecular formula C4H11N\mathrm{C_4H_{11}N} that will give carbylamine test is ________.EasyNumerical value
  6. 4 Sep 2020, Shift 1 · Q45Which of the following will react with CHCl3\mathrm{CHCl_3} + alc. KOH ?MediumSingle correct

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.