Question

Which of the following molecules has minimum bond angle?

• A. $Ni(CO{)}_4$
• B. $\left[Ni\right(CN{)}_4{]}^{2-}$
• C. $CC{l}_4$
• D. $N{H}_4^{+}$

Answer 1

The correct option is B $\left[Ni\right(CN{)}_4{]}^{2-}$

$\left(A\right)$ $Ni(CO{)}_4$ as $CO$ is strong field ligand so the pairing of electrons occurs. The shape of the molecule is Tetrahedral with bond angle $\approx {109}^o$ as shown in IMAGE $01$.

$\left(B\right)$ $\left[Ni\right(CN{)}_4{]}^{2-}$ as $C{N}^{-}$ is strong ligand so the pairing of inner electrons occurs.

So, the shape of complex $=$ Square Planar as shown in IMAGE $02$

$\left(C\right)$ $CC{l}_4$ as refer to IMAGE $03$

$\left(D\right)$ $N{H}_4^{+}$ so, molecule having minimum bond angle is $\left[Ni\right(CN{)}_4{]}^{2-}$ as shown in the IMAGE $04$