JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 25 July 2022, Shift 2, Chemistry Q88

Question 88 of 90 in this shift, Chemistry question 28 of 30, Section B.

A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is __ g/mol. [Nearest integer]

Official answer

NTA final key.

Chapter: Alcohols, Phenols and Ethers
Topic: Mole Concept
Idea tested: Molar Mass and Gas Volume

Same idea in other shifts

Asked 5× in all

4 Apr 2026, Shift 1 · Q51Number of moles and number of molecules in $1.4187$ L of $\mathrm{SO_2}$ at STP respectively areEasySingle correct
27 Jun 2022, Shift 1 · Q89Two elements A and B which form 0.15 moles of $\mathrm{A_2B}$ and $\mathrm{AB_3}$ type compounds. If both $\mathrm{A_2B}$ and…MediumNumerical value
28 Jun 2022, Shift 2 · Q81100 g of an ideal gas is kept in a cylinder of 416 L volume at 27°C under 1.5 bar pressure. The molar mass of the gas is __________ g…MediumNumerical value
2 Apr 2017 (offline) · Q321 gram of a carbonate ( $\mathrm{M_2CO_3}$ ) on treatment with excess HCl produces 0.01186 mole of $\mathrm{CO_2}$ . The molar mass of…EasySingle 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.