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The structures below are:                  

The rate of precipitate formation increases for the reaction of 1-bromobutane with NaI as the concentration of NaI is increased.  When the concentration of NaI is increased in the reaction of 2-chloro-2-methylpropane, no rate change is observed.  Why is there a change in rate in the first case and not in the second?    

The absolute configuration at the asymmetric carbon center in the following molecule is ______.

Phenylalanine is an amino acid that is essential to human nutrition. The representation below shows the structure of phenylalanine at physiological pH. In this representation of phenylalanine, the formal charges on N and the oxygen labelled B are _________________________ respectively.                                    

Which of the following molecules, if isolated in its pure form, would demonstrate optical activity ?    

What is the classification of the following molecule assuming a planar structure?           

How many asymmetric carbon atoms are present in the molecule shown?    

What synthetic goal is achieved by subjecting an alkene to an oxymercuration-demercuration  sequence?    

What does the number 2 represent in the E2 reaction?  

Which of the following does not contain a carbonyl group?