Stability order of Carbocation Carbanion and Carbon free radical

Stability order of Carbocation
 

(CH₃)₃C⁺  >  (CH₃)₂C⁺  >  CH₃C⁺  >  C⁺H₃ 

       3'C  >   2'C  >  1'C  >  Methyl carbocation



Stability order of carbanion
 

   (CH₃)₃C^-  <  (CH₃)₂C^-  <  CH₃C^-  <  C^-H₃ 

    3'C  <  2'C  <  1'C  <  Methyl carbanion

Stability order of Carbon free radical 

   (CH₃)₃C^*  >  (CH₃)₂C^*  >  CH₃C^*  >  C^*H₃ 

    3'C  >   2'C  >  1'C  >  Methyl free radical