Alkenes

Question 1

Why are alkenes vulnerable to to electrophilic attack

Answer 1

The C=C double bond has high electron density so is vulnerable to attack by electrophiles

Question 2

Outline the order of stability for carbocations

Answer 2

Most stable: tertiary
Secondary
Least stable: primary

Question 3

What makes a carbocation more stable than another

Answer 3

• the major product will be the more stable carbocation
• because the methyl groups on either/one side of the positive carbon are electron releasing and reduce the charge on the ion
• inductive effect of alkyl groups

Question 4

How are addition polymers formed

Answer 4

From alkenes. The double bond breaks

Question 5

Why are addition polymers unreactive

Answer 5

Due to strong C-C and C-H bonds

Question 6

What are the uses of poly(chloroethene) PVC when a plasticiser is added

Answer 6

• when a plasticiser is added the intermolecular forces between polymer chains are weakened
• which allows the polymer to be more flexible
• so it can be used in electrical wires, and waterproof clothes