Aromatic chem Flashcards
1
Q
What does benzene consist of
A
- 6 Carbons
- 6 Hydrogren
- ring of delocalised electrons
2
Q
Describe the bond lenghts in benzene
A
Alternating between short double bonds and longer single bonds
3
Q
How is the ring of charge formed
A
- Outer electron from the p-orbital is delocalised
- they overlap to form the central ring
- this makes benzene very stable compared to other molecules
4
Q
What was benzene previously called
A
cyclohexatriene
5
Q
What was the predicted vs actual enthalpy change of hydrogenation for benzene
A
- predicted = -360kj/mole
- actual = -208kJ/mole
6
Q
What is the melting point of arenes like and why
A
High melting points because the delocalised ring stablises
7
Q
What are the boiling points of arenes like and why
A
Low boiling points because they are non polar and often cannot be dissolved in water
8
Q
What is the electrophile in the electrophillic addition to form nitrobenzene
A
NO2+
