Chapter 7 Part 2:Is the Mechanism Sn1 or Sn2?

Question 1

What is the most important factor in determining whether the reaction occurs via Sn1 or Sn2?

Answer 1

The º of the alkyl halide.

Question 2

Which mechanism do 1º alkyl halides use?

Answer 2

Sn2 Only

Question 3

Which mechanism do 2º alkyl halides use ?

Answer 3

Both Sn1 and Sn2. Mechanism is determined by other factors.

Question 4

Which mechanism do 3º alkyl halides use?

Answer 4

Sn1 Only

Question 5

Strong :Nu- favor the ___________ Mechanism

Answer 5

Sn2

Question 6

Weak :Nu- favor the ____________ Mechanism

Answer 6

Sn1

Question 7

How does the leaving group affect the rxn rate of the Sn1 mechanism? the Sn2 mechanism?

Answer 7

better leaving groups increase the rate of both mechanisms

Question 8

Rank these leaving groups from worst to best

R–F / R–OH / R–Cl / R–I / R–NH2

Answer 8

R–NH2 R–OH R–F R–Cl R–I

Question 9

The Sn1 Mechanism prefers a polar _____ solvent

Answer 9

polar protic solvent

Question 10

The Sn2 Mechanism prefers a polar______ solvent

Answer 10

polar aprotic solvent

Question 11

What is the difference between a polar aprotic and a polar protic solvent?

Answer 11

polar protic solvents are capable of hydrogen bonding