Unit 1, Topic 5: Alkenes Flashcards
1
Q
What is the general formula of alkenes?
A
CnH2n
2
Q
Define ‘unsaturated hydrocarbon’
A
a substance containing hydrogen and carbon only that has C=C double bond
3
Q
Define ‘stereoisomerism’
A
same molecular and structural formula but the different arrangement in 3D space
4
Q
Why does geometric isomerism occur?
A
The rotation of C=C is restricted
5
Q
What are the conditions for cis/trans isomers to occur?
A
Only used when there are two identical groups on each carbon on the double bond
cis: same atom or group of atoms on the same side
trans: same atom or group of atoms on opposite side
6
Q
What are the conditions for E/Z isomers
A
E: groups of atoms with higher Mr on different side
Z: groups of atoms with higher Mr on same side
