Question

Why do branched chain compounds have lower boiling points than the corresponding straight chain isomers?

• A. Weaker van der waals forces
• B. Decrease in contact area between molecules
• C. Both A and B
• D. Can not withstand high temperature

Answer 1

Answer: (C)

Both A and B

Branched chain compounds have weaker van der waals forces because of the smaller area of contact between the molecules.

So less energy is needed to overcome the intermolecular force.

Linear chain compounds can line up more closer and therefore have stronger van der waals forces than unbranched compounds.

Option C is correct.