Question

Choose the correct statement(s) among the following:

• A. $\left[ FeCl _{4}\right]^{-}$has tetrahedral geometry
• B. $\left[ Co ( en )\left( NH _{3}\right)_{2} Cl _{2}\right]^{+}$has 2 geometrical isomers
• C. $\left[ FeCl _{4}\right]^{-}$has higher spin-only magnetic moment than $\left[ Co ( en )\left( NH _{3}\right)_{2} Cl _{2}\right]^{-}$
• D. The cobalt ion in $\left[ Co ( en )\left( NH _{3}\right)_{2} Cl _{2}\right]^{+}$has $s p^{3} d^{2}$ hybridization

Answer 1

Answer: (A), (C)

$\left[ Co ( en )\left( NH _{3}\right)_{2} Cl _{2}\right]^{+}$ has $3$ geometrical isomers, one of them is optically active. So, it has $4$ stereoisomers.

I and II are enantiomers. $Co ^{+3}=3 d^{6}$
$d^{2} s p^{3}$ hybridization