Free radical substitution

Question 1

Free radicals are formed by _______ fission

Answer 1

Homolytic

Question 2

Define a free radical

Answer 2

A species with an unpaired electron in its outer shell which makes it highly reactive

Question 3

What compounds were banned from refrigeration due to their impact on the ozone layer?

Answer 3

CFCs
(Chloro-fluoro-carbons)

Question 4

What is needed to form free radicals in the upper atmosphere

Answer 4

UV rays from the sun

Question 5

How many Initiation steps are there in free radical substitution?

Answer 5

1

Question 6

How many Propagation steps are there in free radical substitution?

Answer 6

2

Question 7

How many Termination steps are there in free radical substitution?

Answer 7

3

Question 8

This is an example of what step in free radical substitution?
Cl₂ → Cl. + Cl.

(Full stop denotes radical)

Answer 8

Initiation

Question 9

This is an example of what step in free radical substitution?
Cl. + CH₄ → HCl + .CH₃

(Full stop denotes radical)

Answer 9

Propagation

Question 10

This is an example of what step in free radical substitution?
F. + O₃ → FO. + O₂

(Full stop denotes radical)

Answer 10

Propagation

Question 11

This is an example of what step in free radical substitution?
Cl. + .CH₃ → CH₃Cl

(Full stop denotes radical)

Answer 11

Termination

Question 12

This is an example of what step in free radical substitution?
F. + F. → F₂

Full stop denotes radical

Answer 12

Termination