HARD UNIT 4 - alkenes Flashcards
1
Q
How can alkenes be prepared?
A
By dehydration of alcohols using aluminium oxide, concentrated sulfuric acid or phosphoric acid.
By base-induced elimination of hydrogen halides from monohaloalkanes.
2
Q
What can alkenes take part in electrophilic reactions with?
A
Hydrogen to form alkanes in the presence of a catalyst.
Halogens to form dihaloalkanes.
3
Q
What addition reaction involves alkenes?
A
Alkenes and hydrogen halides to form monohaloalkanes.
4
Q
How do alkenes form alcohols?
A
They undergo a hydration reaction with water using an acid catalyst - also an addition reaction.
5
Q
What is the hydrogenation reaction of alkenes catalysed by?
A
Nickel or platinum.
6
Q
What is hydration of an alkene catalysed by?
A
Phosphoric acid.
