Which of the following species does not have tetraahedral geometry ?

Options

A. `BH_(4)^(-)`
B. `NH_(2)^(-)`
C. `CO_(3)^(2-)`
D. `H_(3)O^(+)`

Answer

C

Explanation

`BH_(4)^(-):H=^(1//2)[5+4-1+0]=4(sp^(3))`
`NH_(2)^(-):H=^(1//2)[5+2-0+1]=4(sp^(3))`
`CO_(3)^(2-):H=^(1//2)[4+0-0+2]=3(sp^(2))`
`OH_(3)^(+):H=^(1//2)[6+3-1+0]=4(sp^(3))`
`CO_(3)^(2-)` ion has trigonal geometty.