જ્યાં $\underset{(i)}{\mathop{\gamma =C{{H}_{3}}CO_{2}^{-},}}\,\,\,\,\,\,\underset{(ii)}{\mathop{Cl-C{{H}_{2}}-CO_{2}^{-},}}\,\,\,\,\,\,\,\underset{(iii)}{\mathop{Ph-SO_{3}^{-}}}\,$
$Ph-SO_{3}^{\Theta }>Cl-C{{H}_{2}}-CO_{2}^{\Theta }>C{{H}_{3}}-CO_{2}^{\Theta }$
(weak base good leaving group)