3.3.4 - Alkenes

Question 1

Alkenes

Answer 1

Unsaturated hydrocarbons, they contain a carbon-carbon double bond which is an area of high electron density making it susceptible to attack from electrophiles

Question 2

Test for alkenes

Answer 2

Bromine water, orange-brown to colourless is double bond is present

Question 3

Electrophiles

Answer 3

Lone pair acceptors

Question 4

Common electrophiles

Answer 4

HBr
Br2
H2SO4

Question 5

Reaction mechanism to form alcohols or halogenoalkanes from alkenes

Answer 5

Electrophilic substitution

Question 6

Carbocations

Answer 6

Varying stability, tertiary is the most stable and primary is the least. The more stable the carbocation, the more likely it is to form

Question 7

Addition polymers

Answer 7

Produced from alkenes where the double bond is broken to form a repeating unit

Question 8

Reaction conditions to produce branched chain polymers with weak intermolecular forces

Answer 8

High pressures and temperatures

Question 9

Reaction conditions to produce straight chain polymers with strong intermolecular forces

Answer 9

Lower pressures and temperatures

Question 10

Uses of polymers

Answer 10

Shopping bags

Question 11

Electrophilic substitution

Answer 11

Alkenes to alcohols or halogenoalkanes