In an exothermic reaction energy diagram, what is the relationship between the reactants' and the products' energies?

A) The products are higher than the reactants.
B) The reactants are higher than the products.
C) Both reactants and products are the same energy.
D) The reactants are always higher than the activation energy.

Which of the following terms best describes the reactive nature of a Grignard reagent?

A) carbocation
B) free radical
C) electrophile
D) nucleophile
E) carbene