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Q.

A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methyl magnesium iodide. A gas is evolved and is collected and its volume is measured to be 3.1 ml. The molecular weight of the unknown alcohol is ___________ g/mol is

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answer is 33.

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Detailed Solution

ROH+CH3mgI→ROmgI+CH4(g)moles   of  CH4=moles  of  ROH⇒V22400=mM.M⇒3.122400=4.5×103M.M⇒MM=32.51Nearest   integer=33

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