$[Nu^-=(A) \,PhO^-, (B)\,AcO^-, (C)\, HO^-, (D)\, CH_3O^-]$
The acid character follows the order:
\(-C H_{3} C O O H>C_{6} H_{5} O H>H_{2} O>C H_{3} O H\)
The basic character will follow the order
\(-C H_{3} C O O^{-} < C_{6} H_{5} O^{-} < O^{-} H < C H_{3} O\)
$(i)$ ${C_6}{H_5}{N^ + } \equiv NC{l^ - }$ $(ii)$ ${C_6}{H_5}{N^ + } \equiv N$
$(iii)$ ${{\overset{\centerdot }{\mathop{C}}\,}_{6}}{{H}_{5}}$ $(iv)$ $C_6H_5Cl$