Which of the following structures has the S configuration?  

Which of the following is the correct wedge and dash structure for the following Newman projection?

What is the percentage of the S enantiomer in a sample of carvone that has a specific rotation of -30, given that the specific rotation of (R)-carvone is −61?

Bonus question What is the relationship between the following two molecules?

Which arrow(s) indicates chiral center(s) in the compound shown?

Which statement is correct concerning the relative stabilities of the two conformations, A and B, below?  

Identify the lowest energy conformation of butane as a Newman projection looking down the C2-C3 bond.

What is the appropriate IUPAC name for compound shown?

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) ​ 1. −CH2OH 2. −CHO 3. −OCH3 4. −OCOCH3 ​

Bonus question Which are identical compounds?