Question

Which of the following complex is inner orbital as well as low spin complex ?

• A. $\left[Cr\right(H_{2}O{)}_6{]}^{3+}$
• B. $\left[Fe\right(CN{)}_6{]}^{3-}$
• C. $\left[Cu\right(CN{)}_4{]}^{3-}$
• D. $\left[Mn\right(N{H}_3{)}_6{]}^{2+}$

Answer 1

Answer: (B)

$\left[Fe\right(CN{)}_6{]}^{3-}$

$\left[\stackrel{III}{Cr}\right(H_{2}O{)}_6{]}^{3+}$ ; Hybridization: d${}^2$sp${}^3$, inner orbital complex.

$\left[\stackrel{+III}{Fe}\right(CN{)}_6{]}^{3-}$ Hybridization: d${}^2$sp${}^3$, Inner orbital / low spin / spin paired complex.

$\left[\stackrel{+I}{Cu}\right(CN{)}_4{]}^{3-}$ ; Hybridization: sp${}^3$

$\left[\stackrel{+II}{M}n\right(N{H}_3{)}_6{]}^{2+}$ ; P < ${\Delta }_0$; Hybridization: sp${}^3$d${}^2$ : outer orbital / high spin / spin free complex.