In each case tell which SN2 reaction will proceed faster.
1. The displacement by OH- on (a) CH₃Br or (b) CH₃I.
2. The displacement by CH₃CO₂- on 1-bromopropane in (a) dimethylformamide or (b) water.
For each pair of reactants below select the one that is more nucleophilic.
1.(a) BF₃ or (b) F-.
2.(a) -OH or (b) -SH.