Stereoisomerism

Question 1

Define geometric isomerism

Answer 1

A compound which contains a non-rotational C=C bond, and carbon atoms in the double bond have to have 2 different groups bonded to them

Question 2

What is the difference between an E and Z isomer ?

Answer 2

E = groups with highest atomic number on opposite sides
Z = same side

Question 3

Define an optical isomer?

Answer 3

Compound which has 4 different atoms/groups attached to a carbon atom, called a chiral centre

Question 4

What are pairs of optical isomers called?

Answer 4

Enantiomers

Question 5

What does it mean if the enantiomers are optically active?

Answer 5

They rotate the plane of polarised light in opposite directions

Question 6

Define a racemic mixture/ race mate?

Answer 6

An equimolar mixture of the 2 optical isomers.
- rotate the plane of polarised light in opposite directions therefore cancel each other out and become optically inactive

Question 7

Define Stereoisomerism

Answer 7

Compounds with the same structural and molecular formula but have a different arrangement of atoms in space.