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• 20.Which one of the listed compounds is consistent with the following NMR spectrum?(A)(B)(C)(D)(E)
• 21. Which pair of reagents would produce the highest yield of (R)-2-ethoxybutane? (A)sodium (S)-2-bu
• 22.Which of the following represents the highest occupied molecular orbital for the conjugated pi sy
• 23. When 1 mole of anbydrous HC1 is reacted with excess 1,3-pentadiene, the 1,2 and the 1,4-addition
• 24. Which of the following aromatic compounds wil have the most significant number of signals in a 1
• 25. Choose the best reagent(s) from the list below for the following conversions. Place the letter o
• 26. Which of the following could successfully undergo a Friedel-Crafts alkylation? Assume an appropr
• 27. Choose the BEST reagent for each of the following conversions.(A)LiAJH4, THF (B)NaBH4, ethanol (
• 28. Which labeled peaks would distinguish an aldehyde from a ketone based on this spectrum? (A)1 (B)
• 29. Which labeled peaks would distinguish an aldehyde from a ketone based on this spectrum? (A)1 (B)
• 30. In the diagram below, fill in the terms in the appropriate places indicated by a letter.(A)A - r
• 31. Consider the following diagram. Which letter should be filled in on the bottom line? (A)GCU(B)UC
• 32. Which of the following monomers is least readily polymerized under anionic polymerization condit
• 33. Which reagent below could best be used to distinguish CH3(CH2)10CO2H fromCH3(CH2)4CH=CH(CH2)4CO2
• 34. Which of the following will result in removing a benzyl protecting group of benzyl ester? (A)aci
• 35. Which of the following is a nucleophile that does conjugate additions? (A)CH2=CHCHO (B)CH2=CHCN
• 36. Arrange the carboxylic acid derivatives below to increase reactivity towards nucleophilic acy\/
• 37. What is the product of the following reaction?(A)(CH3)3CCH2CH2CH2COOH (B)(CH3)3CCH2CH2CH2NH2 (C)
• 38. An ether solution of PhCO2H ( A ), PhNH2( B ), and PhCH3( C ) is extracted with aqueous NaOH. Wh
• 39. Which of the following amines is the most robust base? (A)cyclohexylamine (B)pyrrole (C) p-iodoa
• 40. Which of the following is an incorrect description of benzene? (A)The CCC bond angles are all eq