Isomerism Flashcards
1
Q
Forms of stereo-isomerism
A
Geometric
Optical
2
Q
Optical isomers occur when…
A
there are four different substituents attached to one carbon atom
3
Q
Optical isomers result in…
A
two isomers that are non-superimposable mirror images of one another, but are not identical
4
Q
Non-superimposable
A
when molecules cannot be placed on top of one another and give the same molecule
5
Q
No. of optical isomers =
A
2^n
where n= no. of chiral carbons.
6
Q
Feature of light
A
Waves vibrate in all direction at right angles from the direction of motion of the light wave
7
Q
Mirror image isomers are identical in:
A
- Solubility
- Melting point
- Boiling point
8
Q
Describe how separate samples of each of these enantiomers could be distinguished
A
- pass the plane polarised light through the solution of the compound
- enantiomers would rotate light in opposite directions
9
Q
Explain why the reaction produces a racemic mixture
A
- planar C = O bond
- attack from above or below
- with equal probability/ produce equal amounts
