
\((2)\) +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 \(>\) \(III\)


$(A)\, CH_3 - CH_2 - C \equiv C^-$ $(B) \,CH_3 -CH_2 - S^-$
$(C) \,CH_3 - CH_2 - CO^-_2$ $(D)\, CH_3 -CH_2 - O^-$