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Question

Arrange the following compounds in their decreasing order of boiling points:
I. C9H20          II. C8H18

III.(CH3)2C(CH2)4CH3

IV. CH3CH3|C|CH3CH3|C|CH3CH3
  1. (I)>(III)>(II)>(IV)
  2. (I)>(II)>(III)>(IV)
  3. (IV)>(III)>(II)>(I)
  4. (IV)>(II)>(III)>(I)


Solution

The correct option is B (I)>(II)>(III)>(IV)
The given hydrocarbons are alkanes.
Greater the number of carbon atoms, higher the boiling point due to higher molecular mass. For the same number of carbon atoms, branching reduces the boiling point. 

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