Which of the following statements about a catalyst is true?

Which of the following is the major E2 product formed from the following alkyl halide?  

Rank the following ions in order of increasing nucleophilicity in polar aprotic solvents, starting with the least nucleophilic ion.  

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/molB → C    Ea = 10 kcal/mol,    ΔH° = -6 kcal/molC → D    Ea = 2 kcal/mol,      ΔH° = -20 kcal/molWhich of the three steps is rate determining?

What is the major product for the following reaction?   

Which alkyl halide reacts the fastest in an E2 reaction?

What is(are) the major organic product(s) obtained from the following substitution reaction?

What type of bond cleavage takes place in/what type of intermediate is produced in the following reaction?

What is (are) the product(s) of the following reaction?  

Consider the substitution reaction shown below. By what mechanism will the reaction proceed?