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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.
  1. (i) > (ii) > (iii)
  2. (iii) > (ii) > (i)      
  3. (i) > (iii) > (ii)
  4. (iii) > (i) > (ii)


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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