14.0 Alkenes

Question 1

Describe the functional group in alkenes.

Answer 1

C=C
Carbon carbon double bond

Question 2

What is the difference between saturated and
unsaturated hydrocarbons.

Answer 2

Saturated contain all single bonds.
Unsaturated contain at least one C=C.

Question 3

Define an electrophile.

Answer 3

Electron pair acceptor.

Question 4

Give three examples of electrophiles that react with
alkenes.

Answer 4

Br2, HBr, H2SO4.

Question 5

Write an equation to show the reaction of ethene
with bromine water.

Answer 5

CH2CH2 + Br2 → CH2BrCH2Br

Question 6

Explain why there is a major and minor product
formed in the electrophilic addition of unsymmetrical alkenes.

Answer 6

Carbocation stability increases from
primary<secondary<tertiary. The more stable the
carbocation formed, the more abundant the product.

Question 7

Why are addition polymers unreactive?

Answer 7

The carbon-carbon bonds are very stable and need lots of energy to break.

Question 8

What conditions can be altered to form polymers
from the same monomers but with different
properties?

Answer 8

Temperature
Pressure
Catalyst