In which of the following molecules/ions in the central atom `sp^2`-hybridized?

Options

A. `NO_2^-` and `NH_2^-`
B. `NH_2^-` and `H_2O`
C. `NO_2^-` and `H_2O`
D. `BF_3` and `NO_2^-`

Answer

D

Explanation

`underset"Planar structure"(underset(F)underset(|)overset(F)overset(|)(.^sigmaB)oversetsigma-F)rArr3sigma`-bonds , i.e. `sp^2` hybridisation
`NO_2^-`
`O=:ddotN:^(theta)=OrArr2sigma`-bonds +1 lone pair of electrons, i.e. `sp^2` hybridisation
`NH_2^-`
`Hoversetsigma-underset(.x)ddotNoversetsigma-HrArr 2sigma`-bonds +2 lone pairs, i.e. `sp^3` hybridisation

`rArr 2sigma`-bonds+2 lone pairs, i.e. `sp^3` hybridisation Thus, in `BF_3` and `NO_2^-` central atom is `sp^2` hybridised, while `NH_2, NH_3 and H_2O` are `sp^3` hybridised.