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Boiling Point of Alkanes

Arrange the f...

Question

Arrange the following compounds in the decreasing order of their boiling points
(i) Pentan -1- ol (ii) 2-methylbutan -2- ol (iii) 3- Methylbutan–2- ol.

A

(i) > (ii) > (iii)

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B

(iii) > (ii) > (i)

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C

(iii) > (i) > (ii)

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D

(i) > (iii) > (ii)

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Solution

The correct option is A (i) > (ii) > (iii)
This is because with branching the shape becomes spherical and therefore, vanderwaals forces decrease.
As a result, boiling point decreases.

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