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Before patients are prescribed bisphosphates what must the patient have normal levels of?

Which of the following is the best nucleophile?    

Which one of the following correctly describes the reaction below?      

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 structures below are:                  

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?