Isomerism Flashcards
1
Q
🔴️How enantiomers mixtures are distinguish
A
- Shine plane polarised light
- would rotate plane of light in opposite directions
- by the same amount
2
Q
🔴️Stereoisomerism
A
Same molecular formula and structure but different atomic arrangement in space
3
Q
🔴️Define Racemic mixture and explain why it’s formed
A
- Optically inactive
- Equal mole enantiomers in mixture
- equal probability** of planar carbonyl group C=O being attacked from above or below the **plane
4
Q
Why isn’t the pentan-2-ol produced optically active
A
racemic mixture formed (so equal amount)
5
Q
Suggest one advantage and one disadvantage of using a racemate rather than a single enantiomer in medicines.
A
adv:
- cheaper medicine due to cost of separation
disadv:
- one enantiomer may be ineffective so double dose required
- may be side effects from one enantiomer in the mixture
6
Q
Why does a molecule show optical isomerism
A
- contains asymmetric carbon
- with 4 different groups attached
7
Q
Name the type of isomerism shown by CH3CH=CHCH3 and state the requirements for this
A
- Geometrical isomerism
- Double bond C=C
- 2 Different atoms/groups on each C
