Stereoisomerism

Question 1

What is stereoisomerism?

Answer 1

Compound have the same molecular formula and the same structural formula but, they have a different arrangement of atoms in space

Question 2

What 2 properties must a molecule have to satisfy E/Z isomerism?

Answer 2

1. C=C double bond
2. Each carbon in the double bond must be attached to two different group

Question 3

Where are the groups attached if a molecule has E isomerism?

Answer 3

Opposite ends of the C in the double bond

(Top and bottom)

Question 4

Where are the groups attached if a molecule has Z isomerism?

Answer 4

Same end of the C in the double bond

(Top and Top) or (Bottom and Bottom)

Question 5

What is cis-trans isomerism?

Answer 5

1. Must have a C=C double bond with two different groups attached
2. One of the attached groups must be a H atom

Question 6

Which correspond between cis-trans and E/Z?

Answer 6

Cis = Z
Trans = E (opposite)

Question 7

How is priority of attached groups determined?

Answer 7

1. The higher the atomic number, the higher the priority

Question 8

How do you assign priority to two molecules with the same initial atom attached to carbon?

Answer 8

Continue along the molecule until you find the first point of difference and then compare atomic number to assign priority.