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Predict the product for the following SN2 reaction.

Enantiomers are:

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?

What substitution reaction mechanism is most likely for the following conversion?

Predict the sign of ΔS for the following reaction.

How many chirality centers are there in Lovastatin (Mevacor®, a cholesterol-lowering drug)?

The most stable conformation of trans-1-tert-butyl-2-methylcyclohexane is the one in which:

Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane? 

In the first paragraph, why do the authors refer to The New York Times?   

Which of the following alkyl halides is a primary alkyl halide?