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12 Nov 2019
20. Which two (2) of these resonance structures make the greatest contributions to the resonance hybrid for the intermediate in the SNAr reaction of o-chloronitrobenzene with methoxide ion? (circle 2 answers) 22. What is the best sequence to prepare benzonitrile, CoHsCN from benzene? a) CHil, AICls; then Br2, hv; then KCN b) CHsl, AICls; then hot KMn0; then H,O*; then SOCl2 then NH3; then NaOH+Cl2 c) HNO,/H2SO4; then Fe/HCl; then HONO, 0-5°C; then CuCN d) Br2, FeCl3; then KCN e) CH,I, AlCls; then Br2 (2 eq.), hv, then hot NaOH; then HCN 23. Consider the synthesis below. What is reagent "Y" NH2 Br Br Br IV i. HONO, 0.5â 1. What reagent can carry out the following transformation? Cl Cl NO2 24. Which reagent would you use as the basis for a simple chemical test that would distinguish between toluene and vinylbenzene (C&HsCH-CH2)? Cl c) NaNH2 d) H PO2 CI a) Fe/HCl; then OH b) HONO; then NH d) NaBH4 e) Nal in acetone
20. Which two (2) of these resonance structures make the greatest contributions to the resonance hybrid for the intermediate in the SNAr reaction of o-chloronitrobenzene with methoxide ion? (circle 2 answers) 22. What is the best sequence to prepare benzonitrile, CoHsCN from benzene? a) CHil, AICls; then Br2, hv; then KCN b) CHsl, AICls; then hot KMn0; then H,O*; then SOCl2 then NH3; then NaOH+Cl2 c) HNO,/H2SO4; then Fe/HCl; then HONO, 0-5°C; then CuCN d) Br2, FeCl3; then KCN e) CH,I, AlCls; then Br2 (2 eq.), hv, then hot NaOH; then HCN 23. Consider the synthesis below. What is reagent "Y" NH2 Br Br Br IV i. HONO, 0.5â 1. What reagent can carry out the following transformation? Cl Cl NO2 24. Which reagent would you use as the basis for a simple chemical test that would distinguish between toluene and vinylbenzene (C&HsCH-CH2)? Cl c) NaNH2 d) H PO2 CI a) Fe/HCl; then OH b) HONO; then NH d) NaBH4 e) Nal in acetone
Bunny GreenfelderLv2
2 Mar 2019