Arrange the following cobalt complexes in the order of increasing crystal field stabilisation energy (CFSE) value.

Complexes :
A . ${[C o F_{6}]}_{6}^{3 -}$
B . ${[C o {(H_{2} O)}_{6}]}_{6}^{2 +}$
C . ${[C o {(N H_{3})}_{6}]}_{6}^{3 +}$
D . ${[C o {(e n)}_{3}]}_{3}^{3 +}$

Choose the correct option :

C < D < B < A

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B < C < D < A

No worries! We‘ve got your back. Try BYJU‘S free classes today!

A < B < C < D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B < A < C < D

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D B < A < C < D
CFSE value increases as the strength of the ligand increases also with increase in positive charge of central atom. According to spectrochemical series, the order of ligand strength is $e n > N H_{3} > H_{2} O > F^{-}$ . So , the CFSE value of the given complexes should be $A < B < C < D$ . But as complex $A$ contain cobalt in +3 oxidation state, $A > B$ . Final order is $B < A < C < D$ .
Hence, option (d) is correct.

Suggest Corrections

Similar questions

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

Arrange the following complex ions in increasing order of crystal field splitting energy $△_{0} .$
$[C r (C l)_{6}]^{3 -}, [C r (C N)_{6}]^{3 -}, [C r (N H_{3})_{6}]^{3 +}$

Q. Arrange the following cobalt complexes in the order of increasing crystal field stabilisation energy (CFSE) value.

Complexes :
A .

{[C o F_{6}]}_{6}^{3 -}

B .

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

C .

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

D .

{[C o {(e n)}_{3}]}_{3}^{3 +}

Choose the correct option :

 JEE Main 2021

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

Join BYJU'S Learning Program

Arrange the following cobalt complexes in the order of increasing crystal field stabilisation energy (CFSE) value. Complexes : A . [CoF6]3− B . [Co(H2O)6]2+ C . [Co(NH3)6]3+ D . [Co(en)3]3+ Choose the correct option :