JEE Main 2022 · 25 Jul · Shift 2 · Chemistry Q88

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ChemistryInteger+4 / -1Question 88 of 90

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]

Your answer

Answer and worked solution

Official answer: 33

Methane $\frac{3.1}{22400}=1.38\times10^{-4}$ mol, equal to moles of ROH: $M=\frac{4.5\times10^{-3}}{1.38\times10^{-4}}\approx33$ .

Answer: 33

Topics:Alcohols Mole concept

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JEE Main 2022 · 25 Jul · Shift 2, Chemistry question 88