0.037g of an alcohol, ROH, was added to $C H_{3} M g B r$ and the gas evolved measured 11.2 ml at STP. What is the molecular weight of ROH?

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Solution

The correct option is A 74
Alcohols react with grignard reagent and form the alkane, methane. one mole of methane is formed from one mole of ethanol
$C_{2} H_{5} O H + C H_{3} M g I \to C H_{4} + M g I O C_{2} H_{5}$
22,400 ml is formed from 1 mole.
11.2 ml is formed from 0.037gms.
22,400 ml is formed from 74gms.
Therefore, molecular weight is 74.

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