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Question

Arrange the compounds in the order of decreasing boiling points.
1. Butane
2. 1,2,3-Pentane triol
3. Butyl alcohol

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

The correct option is A 2>3>1
The decreasing order of boiling point is:
1,2,3-Pentane triol > Butyl alcohol > Butane

In (2), there is presence of three alcohol groups, so it has more H-bonding than in (3). So (2) has more boiling point than (3). (1) has the least boiling point, because it has no alcohol group.

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