JEE Main 2026 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 4 April 2026, Shift 1, Chemistry Q73

Question 73 of 75 in this shift, Chemistry question 23 of 25, Section B.

2.0

g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave

3.36

g of AgBr. The percentage of carbon in the compound (X) is

26.7\%

. Total number of carbon atoms in the empirical formula for compound (X) is ______. (Given molar mass in

\mathrm{g\ mol^{-1}}

H:1, C:12, Br : 80, Ag : 108)

Official answer

NTA final key.

Chapter: Organic Chemistry: Some Basic Principles and Techniques
Topic: Mole Concept
Idea tested: Empirical Formula from Mass Percentage

Same idea in other shifts

Asked 6× in all

6 Apr 2026, Shift 1 · Q51An oxide of iron contains 69.9% iron, its empirical formula, is: (Given : Molar mass of Fe and O are 56 and 16 g mol $^{-1}$ respectively.)EasySingle correct
24 Jun 2022, Shift 2 · Q61120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO $_2$ and 270 g of water on complete combustion. The…EasySingle correct
27 Jun 2022, Shift 2 · Q81116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic…MediumNumerical value
28 Jun 2022, Shift 2 · Q61Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H…MediumSingle correct
2 Sep 2020, Shift 2 · Q50The ratio of the mass percentages of ‘C & H’ and ‘C & O’ of a saturated acyclic organic compound ‘X’ are 4 : 1 and 3 : 4 respectively.…HardNumerical value

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.