is fastest when Z is
A) \[Cl\]
B) \[N{{H}_{2}}\]
C) \[O{{C}_{2}}{{H}_{5}}\]
D) \[OCOC{{H}_{3}}\]
Correct Answer: A
Solution :
is the best leaving group being the weakest nucleophile out of 
and 
NOTE If acid HX is weak, its conjugate base
is strong and vice-versa. 
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