Question #58cbe

1 Answer
Oct 7, 2015

See explanation.


There is a problem with this question, because compound 1 has a higher melting point than compound 2.

Compound 1 has two isomers, that themselves have two different melting points (#-49.44^@C " for trans and" -81.47^@C " for cis"#). The structures of both isomers are depicted in the below image:
enter image source here

For compound 2, the melting point is reported as #-122^@C#.
enter image source here

When we discuss melting point, we consider two main reasons:

  1. The intermolecular interactions.
  2. The packing in the solid.

As it could be seen from the given melting point, the trans-1,2-dichloroethene has the highest melting point because it has the largest surface area and therefor the molecules pack well in the solid which will result in a stronger intermolecular interactions that will result in higher melting point.