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Question

Arrange the compounds in the order of decreasing boiling points.
1. Ethanol
2. Propane
3. Pentanol

A
1>2>3
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B
3>1>2
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C
1>3>2
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D
3>2>1
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Solution

The correct option is B 3>1>2
The decreasing order of boiling points is Pentanol >Ethanol >Propane
(3>1>2)

Pentanol and ethanol have H-bonding, but molecular mass of pentanol is more than ethanol, so it has high boiling point. Propane has the least boiling point due to non-polar character and weak van der waals forces of attraction.

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