Consider following reactions-I- -CoNH36-3-aq-6H3O-aq- -CoH2O6-3- aq-6NH4-aqThe products are favoured in the above reaction-II- -CoNH36-2-aq-6H3O-aq- -CoH2O6-2-aq-6NH4-aqThe reaction II takes place with H2O in a matter of seconds-Which is thermodynamically unstable and also kinetically labile-

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Nucleophilic Substitution in Alkyl Halides

Consider foll...

Question

Consider following reactions:

I. $[C o (N H_{3})_{6}]^{3 +} (a q) + 6 H_{3} O^{+} (a q) ⇌ [C o (H_{2} O)_{6}]^{3 +} (a q) + 6 N H_{4}^{+} (a q)$

The products are favoured in the above reaction:

II. $[C o (N H_{3})_{6}]^{2 +} (a q) + 6 H_{3} O^{+} (a q) \to [C o (H_{2} O)_{6}]^{2 +} (a q) + 6 N H_{4}^{+} (a q)$

The reaction (II) takes place with $H_{2} O$ in a matter of seconds.

Which is thermodynamically unstable and also kinetically labile?

[C o (H_{2} O)_{6}]^{3 +}

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[C o (H_{2} O)_{6}]^{2 +}

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[C o (N H_{3})_{6}]^{3 +}

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[C o (N H_{3})_{6}]^{2 +}

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Solution

The correct option is A $[C o (N H_{3})_{6}]^{2 +}$
The thermodynamic stability of complex depends on its formation constant ( $β$ ).
Higher is its formation constant, greater the stability.
The kinetic nature of a complex depends on nature of other reactants, temperature, solvent etc.

$[C o (N H_{3})_{6}]^{2 +}$ is thermodynamically unstable as it has low $β$ value. This is possible because its reaction with $H_{2} O$ in acidic medium is slow. Thus, it is thermodynamically inert and kinetically labile.
Therefore, D is correct option.

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Similar questions

Consider following reactions:

[C o (N H_{3})_{6}]^{3 +} (a q) + 6 H_{3} O^{+} (a q) ⇌ [C o (H_{2} O)_{6}]^{3 +} (a q) + 6 N H_{4}^{+} (a q)

The products are favoured in the above reaction:

II.

[C o (N H_{3})_{6}]^{2 +} (a q) + 6 H_{3} O^{+} (a q) \to [C o (H_{2} O)_{6}]^{2 +} (a q) + 6 N H_{4}^{+} (a q)

The reaction (II) takes place with

H_{2} O

in a matter of seconds.

Which is true in terms of

Δ G^{o}

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, $[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}$
(a) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$
(b) $[C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +}$
(c) $[C o (H_{2} O)_{6}]^{3 +} > [C o (N H_{3})_{6}]^{3 +} > [C o (C N)_{6}]^{3 -}$
(d) $[C o (C N)_{6}]^{3 -} > [C o (N H_{3})_{6}]^{3 +} > [C o (H_{2} O)_{6}]^{3 +}$

Q. The correct increasing order of wavelengths of absorption in the visible region for the complexes of

C o^{3 +}

is:

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $C o^{3 +}$ is

Q. Correct increasing order for the wavelength of absorbtion in the visible region for the complexes of

C o^{3 +}

is:

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