7. Substitution Reactions

Formation of the carbocation should be fastest for which leaving group?

(c)

Which of the following is the better leaving group in a polar aprotic solvent?

(c) Br ⁻ vs. I ⁻

Which member in each pair in [PROBLEM 9-68] is a better leaving group?

a. H₂O or HO⁻

b. NH₃ or H₂O

Which member in each pair in [PROBLEM 9-68] is a better leaving group?

c. H₂O or H₂S

d. HO⁻ or HS⁻

Explain why the rate of the reaction of 1-bromo-2-butene with ethanol is increased if silver nitrate is added to the reaction mixture.

Which reaction in each of the following pairs takes place more rapidly? (EtOH is ethyl alcohol; Et₂O is diethyl ether.)

a.

b.

c.

Which substitution reaction takes place more rapidly?

d. CH₃CH₂Cl + I⁻ or CH₃CH₂Br + I⁻