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Question

0.037g of an alcohol, ROH, was added to CH3MgBr and the gas evolved measured 11.2 ml at STP. What is the molecular weight of ROH?

A
47
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B
79
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C
74
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D
77
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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
C2H5OH+CH3MgICH4+MgIOC2H5
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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