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.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

answerto predict;