\((2)\) +ve charge on less electronegative atom is more stable i.e., \(\mathrm{C}^{\oplus}\) is more stable than \(\mathrm{O}^{\oplus}\)
\(\therefore \quad\) Order is \(\mathrm{I}>\) II \(>\) \(III\)
$(i)$ ${C_6}{H_5}{N^ + } \equiv NC{l^ - }$ $(ii)$ ${C_6}{H_5}{N^ + } \equiv N$
$(iii)$ ${{\overset{\centerdot }{\mathop{C}}\,}_{6}}{{H}_{5}}$ $(iv)$ $C_6H_5Cl$
$(1) H_3C - C = C⊝\,(2) H - C = C⊝ \,(3) $ ${H_3}C\,\, - \,\,\mathop C\limits^\Theta {H_2}$