O- Aromatics =) Flashcards
1
Q
In practice, ethanoic anhydride is used in the industrial synthesis rather than ethanoyl chloride.
Give one reason why ethanoyl chloride is not used in the industrial synthesis. (1)
A
corrosive
2
Q
ΔH of cyclohexene = -120kJmol-1
ΔH of benzene = -208kJmol-1
The enthalpy of hydrogenation of cyclohexa-1,3-diene is not exactly double that of cyclohexene.
Suggest a value for the enthalpy of hydrogenation of cyclohexa-1,3-diene and justify your value. (3)
A
- betw. -239 & -121
- double bonds separated by 1 single bond
- ✔ some delocalisation/ overlap of p-orbitals
3
Q
What is the role of HNO3 in:
HNO3 + 2H2SO4 –> NO2+ + H3O+ +2H2SO4
(1)
A
base
