The decreasing nucleophilic order of the following compound is:
(i)ΘCH3
(ii)ΘNH2
(iii)ΘOH
(iv)ΘF
i > ii > iii > iv
The species which can donate electron pairs easily will be better nucleophile. Among the same period, the nucleophilicity (and basicity) decreases as we move from left to right in the periodic table.
ΘCH3>ΘNH2>ΘOH>ΘF