4.5.4 Alkenes Flashcards
1
Q
What is the general formula for alkenes?
A
CnH2n
2
Q
What do all alkenes have?
A
One C=C double-bond in their carbon chain.
3
Q
What is the formula of ethene?
A
C2H4
4
Q
What is the formula of propene?
A
C3H6
5
Q
What is the formula of butene?
A
C4H8
6
Q
What is the formula of pentene?
A
C5H10
7
Q
Are alkenes saturated or not? why?
A
Unsaturated because there is a C=C double bond.
8
Q
What happens when alkenes react with bromine?
A
When alkenes react with bromine, the C=C double bond is broken and Br atoms are added.
9
Q
What kind of reaction is alkene + bromine?
A
Addition because Br is added into the alkene.
10
Q
What is the colour change in alkene + bromine reaction?
A
orange to colourless because bromine is used up in the reaction.
