Molecular Orbitals Flashcards
1
Q
What is a molecular orbital and how many e can it hold
A
an orbital that forms when atomic orbitalsjoin
2
2
Q
How do sigma bonds form
A
end on overlap
3
Q
how do pi bonds form
A
side on overlap
Unhyrbidised p orbital on either side of Central sigma bond
4
Q
What is hybridisation
A
when orbitals combine to form degenerate hybrid orbitals
5
Q
type of hybridisation in alkanes
A
sp^3
6
Q
type of hybridisation in alkenes
A
sp^2
7
Q
type of hybridisation in alkynes
A
sp
8
Q
what causes electrons to be promoted from HOMO to LUMO
A
absorbs wavelength of light
9
Q
Why are most organic molecules colourless
A
gap between HOMO and LUMO is large
requires energy from UV region to promote e
10
Q
what does a large conjugated system indicate
A
small gap
small energy and frequency
large wavelength
