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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 .

Correct answer

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Step-by-step solution

Alcohols on reaction with Grignard reagent forms hydrocarbons.This is due to the presence of active hydrogen in alcohols and here grignard reagent acts as a base. When any alcohol is treated with methyl magnemsium iodide the hydrocarbon formed should be methane gas. ROH + CH 3 MgI → ROMgI + CH 4 g Number of moles of CH 4 = Number of moles of ROH ⇒ Volume ( Litres )   of   the   gas 22400 = mass   of   the   gas Molecular   mass   of   the   gas (Assuming

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