Consider the three-step mechanism for the reaction of A through intermediates B and C to produce D shown below.   A → B       Ea = 15 kcal/mol, ΔH° = 13 kcal/mol B → C       Ea = 10 kcal/mol, ΔH° = -6 kcal/mol C → D       Ea = 2 kcal/mol, ΔH° = -20 kcal/mol   Which of the three steps is rate-limiting?  

Assuming a chair conformation, which of the following configurations will always have both methyl groups in relative axial/equatorial positions?  

Both (E)- and (Z)-3-hexene can be subjected to a hydroboration-oxidation sequence. How are the products from these two reactions related to each other?    

When (2R)-bromobutane reacts with CH3OH and the resulting mixture is examined in a polarimeter, minimal optical activity is discovered. What is the mechanism for the reaction?  

What is the product when 3-methyl-2-pentene is reacted with HBr?  

What is the relationship between the compounds shown below?                                                            

The primary interaction between molecules of diethylamine (C2H5NH) in the liquid phase is  

Which of the following terms best describes the pair of compounds shown below?      

Which of the following arranges the groups in order of decreasing priority according to the Cahn-Ingold-Prelog sequence rules?    

Rank the following in decreasing order of leaving group ability. Best leaving on the left.