Reactions of Alkenes Flashcards
Why are alkenes more reactive than alkanes?
Due to the presence of the pie bond. The pie bond is weaker than the sigma bond so it is broken more readily.
What is hydrogenation?
The addition reaction in which hydrogen is added across a double bond.
What catalyst and temperature is in a hydrogenation reaction?
Nickel catalyst at 423K
What is halogenation?
The addition reactions with halogens
How do you test for unsaturation?
Add bromine water in drops to sample.
If there is a double carbon bond present the bromine gets added across the double bond.
The orange colour will disappear.
What is formed when alkenes react with gaseous hydrogen halides?
Haloalkanes
What is a hydration reaction?
When alkenes react with steam (water)
What catalyst is in the presence in the hydration reaction?
Phosphoric acid catalyst
What happens in a hydration reaction?
Steam is added across the double bond.
