Question

10) 10) When the carbonyl group of a ketone is protonated A) the resulting species is activated toward nucleophilic addition B) the resulting species becomes more electrophilic subsequent nucleophilic addition on the resulting species is said to occur under acid-catalyzed conditions D) the resulting species has a positive charge. E) all of the above 11) What purpose does FeCl3 serve when benzene undergoes an electrophilic aromatic substitution reaction with chlorine? A) It serves as a Lewis base catalyst by reacting with Cl2 to generate chloride ions, B) It functions by destabilizing the carbocation intermediate and thereby increases the rate of HⓇ C) It serves as a radical initiator to produce the chlorine radical needed to propagate the chain reaction D) It functions by destabilizing benzene through formation of a re-complex E) It serves as a Lewis acid catalyst by reacting with the Cl2 to make it a better electrophile. 11) - loss, 12) 12) The name 2,4,6-tribromobenzene is incorrect. Which of the following is the correct name? A) 1,3,5-tribromobenzene B) tribromobenzene C) mmm-tribromobenzene D) 3,5-dibromobromobenzene E) mm-dibromobromobenzene 13) 13) How many asymmetric centers are in an aldohexose? A) 2 B) 3 C) 4 D) 5 E) 6 14) What is epimerization? A) It involves lengthening the chain of an aldose. B) It involves reduction of an aldose. C) It involves oxidation of an aldose. D) It involves changing the configuration of a carbon by deprotonation followed by reprotonation E) none of the above 14)