Question

Which of the following species is not isostructural with $SiC{l}_4$?

• A. $N{H}_4^{+}$
• B. $SC{l}_4$
• C. $S{O}_4^{2-}$
• D. $P{O}_4^{3-}$

Answer 1

The correct option is B $SC{l}_4$

$SiC{l}_4,N{H}_4^{+},S{O}_4^{2-},P{O}_4^{3-}$ ions are the examples of molecules/ions which are of $A{B}_4$ type and have tetrahedral structures.
$SC{l}_4$ is $A{B}_{4}E$ $(E$ stands for lone pair$)$ type species. Although the arrangement of five $s{p}^{3}d$ hybrid orbitals in space is trigonal bipyramidal, due to the presence of one lone pair of electrons, the shape of $A{B}_{4}E$ species gets distorted and becomes distorted tetrahedral or see-saw according to bent's rule.