Which has higher boiling point?
A. Alkenes
B. Alkadienes
I think my answer would be A because it contains 1 double bond (1 pi bond)
I would agree with you but I would say it contains ONLY 1 double bond.
Yes.. So alkadiene is much more volatile than alkene?
I don't know that I would say MUCH more volatile. That depends upon what two or three alkenes/alkadienes you are comparing. Also it may depend more upon the intermolecular forces than on the number of pi bonds.
To determine which has a higher boiling point between alkenes and alkadienes, we need to consider their molecular structures.
Alkenes contain a carbon-carbon double bond, which consists of one sigma bond and one pi bond. This pi bond restricts the rotation around the double bond, giving the molecule a more rigid structure. As a result, alkenes have stronger intermolecular forces of attraction (van der Waals forces) between their molecules, leading to higher boiling points.
On the other hand, alkadienes contain two carbon-carbon double bonds, resulting in a more complex and bulkier molecular structure. The presence of multiple double bonds further restricts rotation and creates more sites of electron density, leading to stronger intermolecular forces and thus higher boiling points compared to alkenes.
Therefore, the correct answer is B. Alkadienes generally have higher boiling points than alkenes due to their increased number of double bonds.