JEE Main 2026 — General Organic Chemistry Question with Solution
JEE Main 2026 (22 January Shift 1)
Question
Sodium fusion extract of an organic compound with and chlorine water gives violet color to the layer. 0.15 g of gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound is . (Nearest integer)
(Given : molar mass )
(Given : molar mass )
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Show full solutionCorrect answer: 43
Correct answer
43
Step-by-step explanation
The sodium fusion extract gives violet color with CHCl₃ and chlorine water, indicating the presence of iodine.
In the Carius method, 0.15 g of compound Y produces 0.12 g of silver halide precipitate (AgI).
Molar mass of AgI = 108 + 127 = 235 g/mol.
Moles of AgI = 0.12 / 235 = 0.000510 mol.
Since each AgI contains one I atom, moles of I = 0.000510 mol.
Mass of I = 0.000510 × 127 = 0.0647 g.
Percentage of halogen (iodine) in compound Y
= (0.0647 / 0.15) × 100 = 43.1%, which rounds to 43% (nearest integer).
In the Carius method, 0.15 g of compound Y produces 0.12 g of silver halide precipitate (AgI).
Molar mass of AgI = 108 + 127 = 235 g/mol.
Moles of AgI = 0.12 / 235 = 0.000510 mol.
Since each AgI contains one I atom, moles of I = 0.000510 mol.
Mass of I = 0.000510 × 127 = 0.0647 g.
Percentage of halogen (iodine) in compound Y
= (0.0647 / 0.15) × 100 = 43.1%, which rounds to 43% (nearest integer).
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This is a previous-year question from JEE Main 2026, covering the General Organic Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.