Discussion Forum



1)

Isomers of hexane, based on their branching, can be divided in to  three distinct  classes as shown  in the figure.

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  The correct order of their boiling point is 

 


A) I >II >III

B) III > II >I

C) II > III >I

D) III > I >II

Answer:

Option B

Explanation:

 Plan   This problem  is based on the boiling point of isomeric alkanes

 As we know more the branching in an alkane, lesser will be its surface area and lesser will be the boiling point

    On moving left to right (III to I)

  •  branching increases
  •  surface area decreases
  •  boiling point decreases

 Hence, correct choice is (b)