JEE Main 2026 — Haloalkanes and Haloarenes Question with Solution
JEE Main 2026 (24 January Shift 2)
Question
Grignard reagent reacts with water and forms a gas (Q). One gram of Q occupies at STP. (P) on reaction with dry ice in dry ether followed by forms a compound (Z). 0.1 mole of (Z) will weigh g. (Nearest integer)
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Show full solutionCorrect answer: 6
Correct answer
6
Step-by-step explanation
Grignard reagent RMgBr reacts with water to produce gas Q.
One gram of Q occupies 1.4 L at STP.
Moles of Q = 1.4/22.4 = 0.0625 mol, so molar mass = 1/0.0625 = 16 g/mol, identifying Q as CH₄.
Thus P = CH₃MgBr.
When P reacts with dry ice: .
Upon treatment with H₃O⁺, this gives Z = CH₃COOH (acetic acid).
Molar mass of Z = 60 g/mol.
Mass of 0.1 mol = 0.1 × 60 = 6 g.
One gram of Q occupies 1.4 L at STP.
Moles of Q = 1.4/22.4 = 0.0625 mol, so molar mass = 1/0.0625 = 16 g/mol, identifying Q as CH₄.
Thus P = CH₃MgBr.
When P reacts with dry ice: .
Upon treatment with H₃O⁺, this gives Z = CH₃COOH (acetic acid).
Molar mass of Z = 60 g/mol.
Mass of 0.1 mol = 0.1 × 60 = 6 g.
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This is a previous-year question from JEE Main 2026, covering the Haloalkanes and Haloarenes 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.