Hybridization of central atom in all the following ionic species is sp3 except in

In methyl carbocation, the central atom has 3 bond pairs around it ;Electron pairs=12V+M-C+A; V=Gp.no central atom. M=Number of monovalent gps attached to central atom. C=Charge of cation. A=Charge of anion. E.P= 124+3-1+0 E.P=3 ; Bond pairs= Atoms attached to central atom=3 ; Lone pairs=E.P-L.P ; Lone pairs=3-3=0 ;Hybridization of Carbon in methyl carbocation is sp2 ;