Excess ethylamine is needed in the synthesis of simazine in order to:
a. ensure complete nucleophilic substitution of the cyanuric chloride
b. neutralize the acid formed by the substitution reaction
c. generate the nucleophilic Cl- ion to effect the substitution reaction
d. neutralize the acidic cyanuric chloride
e. form an amine salt with the simazine product
Answer: b. neutralize the acid formed by the substitution reaction