JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 26 February 2021, Shift 2, Chemistry Q49

Question 49 of 90 in this shift, Chemistry question 19 of 30, Section A.

2,4-DNP test can be used to identify :

(1)halogens
(2)aldehydeOfficial answer
(3)amine
(4)ether

Official answer

Option 2

NTA final key.

Chapter: Aldehydes, Ketones and Carboxylic Acids
Topic: Nucleophilic Addition
Idea tested: 2,4-DNP (Brady's Reagent) Test

Same idea in other shifts

Asked 2× in all

7 Apr 2025, Shift 2 · Q68"P" is an optically active compound with molecular formula $\mathrm{C_6H_{12}O}$ . When 'P' is treated with 2, 4-dinitrophenylhydrazine, it…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.