Alkenes

Question 1

What are the reactivity trends for alkenes and why?

Answer 1

Alkenes are more reactive than alkanes due to the presence of a Pi bond
Pi electrons are on the outside of the double bond so they are easier to break as they are more exposed
Because the double bond breaks it is possible to ass atoms and groups to the alkene

Question 2

What do alkenes undergo addition reactions with?

Answer 2

Hydrogen
Halogens
Hydrogen Halides
Steam

Question 3

What happens during Hydrogenation?

Answer 3

Alkenes react with hydrogen in the presence of a nickel catalyst at a temperature of 150 degress c
The Pi bond breaks and the two hydrogen atoms add across the c=c
The produce is an alkane

Question 4

What occurs during halogenation?

Answer 4

Alkenes react with halogens at room temperature
In the reaction the pi bond breaks and the two halogen atoms add across the c=c
Product is a dihaloalkane

Question 5

What occurs during the reaction between alkenes and hydrogen halides?

Answer 5

React at room temperature
Pi bond breaks and the hydrogen and halogen atoms add across the c=c
The product is a haloalkane

Question 6

what occurs during Hydration?

Answer 6

Alkenes react with steam in the presence of a strong acid catalyst and at a temperature of less than 100 dc