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Why branched chains exhibit weak vanderwaal …

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Why branched chains exhibit weak vanderwaal force as compared to normal chains???

Posted by Prakhar J 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Rishabh Rathi 6 years, 11 months ago

branched alkanes 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 alkanes can line up more closer and therefore have stronger van der waals forces than unbranched alkanes. so just remember that van der waals forces are stronger when there is more area of contact between molecules, and obviously area of contact is smaller in branched molecules compared to linear molecules (when they both have the same molecular formula).

Rishabh Rathi 6 years, 11 months ago

It's because when we observed the boiling point of alkane and branched we find that branched has low boiling point which means vanderwaal force is less. That's all i know May be it is due to the open chain has large area and no. of molecules which would add van der waal force. Hope this would help.

Prakhar J 6 years, 11 months ago

Please answer...........i am stuck...

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