Question

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

• A. $SF_4 $ and $XeF_4$
• B. $ SO_3^{2-} $ and $NO_3^-$
• C. $ BF_3 $ and $ NF_3$
• D. $BrO_3^- $ and $ XeO_3$

Answer 1

Answer: (D)

(a) $SF_4 $ =irregular tetrahedral ($sp^3 d$, one lone pair)
$XeF_4$ = square planar ($sp^3d^2$, two lone pairs)
(b) $SO_3^{2-}$ = pyramidal ($sp^3$ , one lone pair)
$ NO_3^-$ = trigonal planar ($sp^2$)
(c) $BF_3$ = trigonal planar ($sp^2$)
$ NF_3$ = pyramidal ($sp^3$)
(d) $BrO_3^-$ = pyramidal ($sp^3$, one lone pair)
$ XeO_ 3$ = pyramidal ($sp^3$, one lone pair)