Reactions of alkanes, Halogenation, Reaction conditions, Free radical reaction mechanism,Curly arrows,The chlorination of ethane

Question 1

Reactions of Alkanes

Answer 1

1. Combustion
   reaction with oxygen
2. Halogenation
   - alkanes react with bromine, chloride to form haloalkanes

Question 2

Reaction Conditions

Answer 2

• Heat or light
  Homolytically breaks the covalent Cl-Cl bond to produce free radicals

Homolytic bond breaking:
When the bond breaks, each atom leaves with one electron

Question 3

Free Radical Reaction Mechanism 1

Answer 3

Initiation:
● producing reactive free radicals

Propagation:
* produces product, and more free radicals
1. radicals collide with alkane, and abstract H
2. radical chain reaction repeats in an endless cycle

Termination:
* two radicals combine to form a stable molecule, and the reaction cycle is ended

Question 4

Curly Arrows
what does th head show ?
wjhat does the tail show ?

Answer 4

head:
* points to where electrons are going
- single: movement of one electron
- double: movement of electron pair

tail:
* shows where electrons have come from