Choose the correct statement(s) among the following:

$( A ) {\left[{FeCl}_{4}\right]}^{-}$

Oxidation number of Fe atom $= + 3$

$Fe \to 3{d}^{6}4{s}^{2}$

${Fe}^{3 +} \to 3{d}^{5}$

$∴ {\left[{FeCl}_{4}\right]}^{-}$ is having tetrahedral geometry

$( B ) {\left[Co ( en ) {\left({\text{ NH }}_{3}\right)}_{2}\right]}$^{+}$have three geometrical isomers.</p><p><img src="https://cdn-question-pool.Quantrex.app/pyq/jee_advanced/3529f58a-c72c-42b0-8d80-ca456514ae59-image.png"/></p><p>$( C ) {\left[{FeCl}_{4}\right]}^{-}$is${sp}^{3}$hybridized with 5 -unpaired electrons. While \left[Co ( en ) {\left({NH}_{3}\right)}_{2}{Cl}_{2}\right] +$ is ${d}^{2}{sp}^{3}$hybridised with zero unpaired electrons.

$( D ) {\left[Co ( en ) {\left({NH}_{3}\right)}_{2}{Cl}_{2}\right]}^{+}$ has ${d}^{2}{sp}^{3}$ hybridization.