DF9- Isomerism

Question 1

Define structural isomerism

Answer 1

Molecules have same molecular formula but different structural formula

Question 2

Define stereoisomerism

Answer 2

Molecules have same structural formula, but different arrangement of atoms in space

Question 3

What are the 3 types of structural isomerism?

Answer 3

• chain
• position
• functional group

Question 4

Define chain isomerism

Answer 4

Type of structural isomerism; hydrocarbons with 4 or more carbons can form branched or chain isomers
E.g. C5H12=pentane, 2-methylbutane, 2,2-dimethylpropane

Question 5

Define position isomerism

Answer 5

When a functional group is situated in different positions on a molecule

Question 6

Define functional group isomerism

Answer 6

When molecules have same molecular formula but different functional groups

Question 7

Where would the hydrogen atoms be in trans-but-2-ene?

Answer 7

On opposite sides of double bond

Question 8

What does cis-but-2-ene look like?

Answer 8

Hydrogens on same side of double bond

Question 9

What are the requirements of E/Z isomers?

Answer 9

• no rotation around double bond

- different groups on each C in double bond