JEE MAIN - Chemistry (2024 - 1st February Evening Shift - No. 5)
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ and $\left[\mathrm{CoF}_6\right]^{3-}$ are respectively known as :
Inner orbital Complex, Spin paired Complex
Spin paired Complex, Spin free Complex
Spin free Complex, Spin paired Complex
Outer orbital Complex, Inner orbital Complex
Explanation
$$
\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}
$$
$\mathrm{Co}^{3+}($ strong field ligand $) \Rightarrow 3 \mathrm{~d}^6\left(\mathrm{t}_{2 \mathrm{~g}}^6, \mathrm{e}_{\mathrm{g}}^0\right)$,
Hybridisation : $\mathrm{d}^2 \mathrm{sp}^3$
Inner obital complex(spin paired complex)
Pairing will take place.
$$ \left[\mathrm{CoF}_6\right]^{3-} $$
$\mathrm{Co}^{3+}($ weak field ligand $) \Rightarrow 3 \mathrm{~d}^6\left(\mathrm{t}_{2 \mathrm{~g}}^4, \mathrm{e}_{\mathrm{g}}^2\right)$
Hybridisation : $\mathrm{sp}^3 \mathrm{~d}^2$
Outer orbital complex (spin free complex)
No pairing will take place
$\mathrm{Co}^{3+}($ strong field ligand $) \Rightarrow 3 \mathrm{~d}^6\left(\mathrm{t}_{2 \mathrm{~g}}^6, \mathrm{e}_{\mathrm{g}}^0\right)$,
Hybridisation : $\mathrm{d}^2 \mathrm{sp}^3$
Inner obital complex(spin paired complex)
Pairing will take place.
$$ \left[\mathrm{CoF}_6\right]^{3-} $$
$\mathrm{Co}^{3+}($ weak field ligand $) \Rightarrow 3 \mathrm{~d}^6\left(\mathrm{t}_{2 \mathrm{~g}}^4, \mathrm{e}_{\mathrm{g}}^2\right)$
Hybridisation : $\mathrm{sp}^3 \mathrm{~d}^2$
Outer orbital complex (spin free complex)
No pairing will take place
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