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Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether, due to the presence of:

1. H-bonding in ethanol
2. H-bonding in dimethyl ether
3. CH₃ group in ethanol
4. CH₃ group in dimethyl ether

Correct answer: H-bonding in ethanol

Solution

Ethanol exhibits hydrogen bonding due to the presence of an -OH group, which significantly increases its boiling point compared to dimethyl ether, which lacks such bonding.

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