Exam 5: Stereochemistry at Tetrahedral Centers

Instructions: Consider the structure of streptimidone below to answer the following question(s). -Refer to instructions.Assign R or S configuration to each chirality center indicated in streptimidone.

The biological importance of enantiomers arises from?

2.10 g of an unknown compound was dissolved in 15.00 mL of ethanol.The sample was placed in a 10.0 cm cell in a polarimeter and the angle of rotation was determined to be -18.48 ^$\circ$ .What is the specific rotation of this unknown and specify if the compound is levorotatory or dextrorotatory?

If (+)-sucrose has a specific rotation of +66.47,what is the specific rotation of (-)-sucrose?

Which of the following physical properties can be used to identify a compound?

What is the relationship between the following pair of structures?

Instructions: In the molecules below,assign R,S configurations to the chirality center indicated with an arrow. -Refer to instructions.The configuration of this carbon atom is _____.

The following atoms are commonly encountered in organic molecules.For which is it not possible to isolate enantiomers due to rapid inversion?

Which of the following is the definition of a pair of enantiomers?

What is the relationship between the following pair of structures?

Which of the following structures represent the same stereoisomer?

Which of the following structures contain a plane of symmetry?

Which of the following is the definition of a pair of diastereomers?

Which of the following statements is true regarding pairs of enantiomers?

Which of the following correctly describes a molecule that is achiral?

Instructions: Place asterisks at all the chirality centers in each molecule below. Place asterisks:

(-)-cholesterol

Instructions: Place asterisks at all the chirality centers in each molecule below. Place asterisks:

Instructions: Identify the indicated hydrogens in the following molecules as pro-R or pro-S. Identify:

How many stereoisomers of 3-bromo-2-butanol exist?