Unit 2-Bond Fission

Question 1

What are the two ways a bond can break?

Answer 1

Homolytic fission

Heterolytic fission

Question 2

What is produced from

1) Homolytic fission
2) Heterolytic fission?

Answer 2

1) Free radicals
2) Ions

Question 3

What condition usually causes homolytic fission?

Answer 3

UV Light (high energy)

Question 4

What type of bonds will heterolytic fission take place in?

Answer 4

Bonds involving atoms with a large difference in electronegativity (polar bond)

Question 5

How do we represent the movement of electrons in a mechanism?

Answer 5

Single-headed arrows for 1 electron and double-headed arrows for 2 electrons

Question 6

What do the tail and head of an arrow indicate in curly arrow notation?

Answer 6

Tail shows source of electron(s) and the head indicates the destination of the electron(s)

Question 7

What are the 3 steps in making a free radical and how do you identify them?

Answer 7

Initiation: no free radicals on reactant side - free radicals on product side

Propagation: free radicals both sides

Termination: free radicals on reactant side, none on product side