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)

$BrO_3^-$ and $XeO_3$

Answer 2

(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)