Q. Among the following, the pair in which the two species are not isostructural, is
A) $SiF_{4}\$and$\ SF_{4}$
B) ${IO}_{3}^{-}\$and$\ XeO_{3}$
C) ${BH}_{4}^{-}\$and$\ {NH}_{4}^{+}$
D) ${PF}_{6}^{-}\$and$\ SF_{6}$
Explanation
(a)
$SiF_{4}\$and$\ SF_{4}$ are not isostructural because $SiF_{4}$ is tetrahedral due to $sp^{3}$ hybridisation of Si while $SF_{4}$ is not tetrahedral but it is distorted tetrahedral because in it S is $sp^{3}d$ hybridised and has a lone pair of electron.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.