Question

Among the following species : $N{F}_3,N{O}_3^{-}B{F}_3,H_3{O}^{+},N{H}_3$ , the isostructural pairs are_____________.

• A. $[N{F}_3,N{O}_3^{-}]$ and $[B{F}_3,H_3{O}^{+}]$
• B. $[N{F}_3,H{N}_3]$ and $\left[N{O}_3^{-}B{F}_3\right]$
• C. $[N{F}_3,H_3{O}^{+}]$ and $\left[N{O}_3^{-}B{F}_3\right]$
• D. $[N{F}_3,H_3{O}^{+}]$ and $[H{N}_3,B{F}_3]$

Answer 1

The correct option is C $[N{F}_3,H_3{O}^{+}]$ and $\left[N{O}_3^{-}B{F}_3\right]$

The iso structural pairs are $[N{F}_3,H_3{O}^{+}]$ and $\left[N{O}_3^{-}B{F}_3\right]$.
$[N{F}_3,H_3{O}^{+}]$ has tetrahedral geometry (pyramidal shape) due to $s{p}^3$ hybridization. The central atom contains $3$ bonding domains and one lone pair of electron. The bond angle is less than ${109.5}^o$
$\left[N{O}_3^{-}B{F}_3\right]$ have trigonal planar geometry due to $s{p}^2$ hybridization. The central atom contains $3$ bonding domains and zero lone pair of electrons. The bond angle is ${120}^o$