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Question

The boiling point of ethanol is higher as compared to the boiling point of diethyl ether though both have the same molecular formula. This is due to:

A
Covalent bonding
B
Resonance
C
H-bonding
D
R-group
Solution
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Correct option is B. H-bonding
The correct option is (B).
Explanation:

The high boiling point of ethanol (78.2 degree Celcius)
compared to dimethyl ether (−23.6degree Celcius ), though both having the same molecular formula C2​H6​O, is due to Hydrogen bonding.
Hydrogen bonding is observed when H atom is attached to more electronegative N, F or O atom.
Ethanol molecules are associated due to hydrogen bonding. This results in higher boiling point.
However, hydrogen bonding is not possible in dimethyl ether.

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