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- Write out the expected splitting pattern for hydrogens Ha, Hp and Hc 3Jab = 10 Hz На Hb 3Jpc = 7 Hz CI Hc Hc Ha:Hb:Hc: doublet, quartet, doublet Ha:Hb:Hc: quartet, quartet, triplet Ha:Hb:Hc: doublet, doublet of triplets, doublet Ha:Hb:Hc: doublet, triplet of doublets, doubletWhich structure is the best nucleophile for an SN2 reaction? A. NH3 B. NH2 C. NH4* D. HCN O B O A O C None of the species shown is a suitable nucleophile for SN2.Rank the nucleophiles in each group in order of increasing nucleophilicity. а. "ОН, NH, Ha0 b. "OH, Br", F (polar aprotic solvent) c. H20, "OH, CHC0O
- 9. Rank the following nucleophiles, in a solution of DMF, in order of weakest to strongest. НО CI Strong Br Slow II II IVUnder the conditions shown below, which anion would be the best nucleophile? "Triflate" is a good leaving group "Triflate" = -oso,CF₂ OSO₂CF3 To NUⓇ CH₂CH₂OH prasi b) Clo Nu Fo -3-0-9-CF₂ O d) Bre SNI 2-ster . 30251 4 • protic shiess17. Which of the following is a mechanism for an SN2 reaction? III. نعت a. I b. II c. III d. IV e. Both I & II LAM Br CN O + Br IV - Br + Br
- Which of the following molecules is most nucleophilic? OA. NaOCH₂CH3 OB. CH3CH₂OH OC. NaOC6H5 OD. C₂H5OH 1 E.CH3COONaIn the reaction CH4 + C12 --> CH3CI + HCI, which is the nucleophile? A CH4 B) C12 C HCI D) CH3CI E NoneWhich of the following is the strongest nucleophile? O a. CH3 O b. NH2 С. O C. HO O d. F .O e. NH3
- In each case tell which SN2 reaction will proceed faster.1. The displacement by I- on (a) CH3Cl or (b) CH3OTos. Select A or B2. The displacement by OH- on (a) CH3Br or (b) CH3I. Select A or BWhich SN2 reaction will occur most rapidly? (Assume the concentrations and temperatures are all the same.) * CH;0 CH3 CI + CI CH,0 + CH + I CH3 C CH;O¯ + + F CH D CH,O Br + BrWhich of the following is the STRONGEST nucleophile? -OH go- II III IV а. I b. II с. Ш d. IV