Wed April 02, 2014 By: Gurpreet Singh

why melting point  of n-propane is less than iso propane?

Expert Reply
Thu April 03, 2014
Dear Gurpreet

n-propane and iso propane are same compounds. There is no difference as only three carbon atoms are present in this alkane.

The melting point is  -187.7° C.
n butane has higher melting point than isobutane. It is because:
  • Straight chain isomers have higher melting point than their more compact isomers because there are fewer dispersion forces in the symmetrical molecule.
  • The dispersion forces of straight chain alkanes increase with molecular weight.
  • Stronger intermolecular forces develop in long chains.

Topperlearning Team.
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