Question

In which of the following pairs, the two species are iso - structural ?

• A. $S{F}_4$ and $Xe{F}_4$
• B. $S{O}_3^{2-}$ and $N{O}_3^{-}$
• C. $B{F}_3$ and $N{F}_3$
• D. $Br{O}_3^{-}$ and $Xe{O}_3$

Answer 1

Answer: (D)

(a) $S{F}_4$ =irregular tetrahedral ($s{p}^{3}d$, one lone pair)
$Xe{F}_4$ = square planar ($s{p}^3{d}^2$, two lone pairs)
(b) $S{O}_3^{2-}$ = pyramidal ($s{p}^3$ , one lone pair)
$N{O}_3^{-}$ = trigonal planar ($s{p}^2$)
(c) $B{F}_3$ = trigonal planar ($s{p}^2$)
$N{F}_3$ = pyramidal ($s{p}^3$)
(d) $Br{O}_3^{-}$ = pyramidal ($s{p}^3$, one lone pair)
$Xe{O}_3$ = pyramidal ($s{p}^3$, one lone pair)