What is the hybridization of ##CH3^-##?

• First you should draw lewis structure of ##CH_3^-##

• Then to find hybridization of central atom/ hybridization of ##CH3^−##,
  • Count the electron regions around central atom
  • In ##CH_3^-## there are 04 electron regions .

(Note: Electron regions are pair of electron, a single bond, a double bond , a triple bond).

• If there is
  • 04 electron regions it's ##sp^3##
  • 03 electron regions it's ##sp^2##
  • 02 electron regions it's ##sp##.

So In ##CH_3^-## there are 04 electron regions , therefore hybridization of it's ##sp^3##