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.                                    

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

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?  

Which of the following structures are achiral and meso?    

Cyclohexene undergoes electrophilic addition with chlorine to yield 1,2-dichlorocyclohexane. Molecules of the product would be