Question

Which of the following has highest nucleophilicity ?
A. `F^(-)`
B. `OH^(-)`
C. `CH_(3)^(-)`
D. `NH_(2)^(-)`

Answer 1

Correct Answer - C
Nucleophilicity is directly related to the basic strength if nucleophilic atoms belong to the same period of the periodic table.
Order of basic strength of conjugates acids:
`HF gt H_(2)O gt NH_(3) gt CH_(4)`
Order of basic sterngth of conjugate bases:
`CH_(3)^(-) gt NH_(2)^(-)gt OH^(-) gtF^(-)`
Thus, order of nucleophilicity is as follows:
`CH_(3)^(-) gt NH_(2)^(-) gt OH^(-) gt F^(-)`