Organic

Question 1

Why do branched-chain isomers have lower boiling points?

Answer 1

There is a smaller surface area/there is less surface contact between molecules meaning there are less London forces so branched isomers require less energy to break

Question 2

During fractional distillation why are there a large number of products formed?

Answer 2

Difference in boiling points mean products separate off at different stages

Question 3

Define homologous series

Answer 3

Same functional group

Same chemical/physical properties

Question 4

What is a primary, secondary and tertiary alcohol?

Answer 4

Primary - attached to 1 carbon - on the end of a chain
Secondary - attached to 2 carbons - in the middle of a chain
Tertiary - attached to 3 carbons - in the middle with methyl group

Question 5

What makes a compound unsaturated?

Answer 5

Double bond

Question 6

Define stereoisomers

Answer 6

Same molecular formula different arrangement of atoms in space