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Q no 100
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Asked by manasvijha | 08 Apr, 2019, 08:45: PM
answered-by-expert Expert Answer
A l l space t h e space c o m p l e x e s space g i v e n space a r e space t h e space o c t a h e d r a l space c o m p l e x e s. space T h e space v a l u e space o f space C F S E space d e p e n d s space o n space v a r i o u s space f a c t o r s space l i k e C e n t r a l space M e t a l space i o n comma space N a t u r e space o f space l i g a n d s space e t c. C F S E thin space f o r space o c t a h e d r a l space c o m p l e x space i s space g i v e n space b y space minus space left square bracket negative 0.4 p plus 0.6 q right square bracket increment subscript 0 space plus space m P w h e r e space p space a n d space q space a r e space t h e space e l e c t r o n s space l y i n g space i n space t subscript 2 g end subscript space a n d space e subscript g space s e t s space o f space o r b i t a l s space a n d space P space i s space t h e space p a i r i n g space e n e r g y. S t r o n g space f i e l d space l i g a n d s space l i k e space N H subscript 3 comma space N O subscript 2 space e t c space p a i r s space t h e space e l e c t r o n s space w h e r e a s space w e a k space f i e l d space l i h a n d s space l i k e space F comma space H subscript 2 O space a r e space u n a b l e space t o space p a i r space t h e space e l e c t r o n s. R e f e r space t h e space t a b l e space a t t a c h e d space f o r space t h e space c o m p a r i s o n space o f space r e s p e c t i v e space C F S E space v a l u e s minus space
 
 
Complexes Nature CFSE Value Mn+ Configuration
[Co(NH3)6]+3 Strong Field
(> -2.4Δ0
Since NH3 is stronger ligand than CN
Pairing energy is more 
 Co+3 4s0 3d6
[Co(CN)6]+3 Strong Field -2.4Δ0
Co+3
4s0 3d6
[Co(F)6]+3
 Weak Field -0.4Δ0
Co+3
4s0 3d6
[Co(H2O)6]+3 Weak Field > -0.4Δ0 Water is stronger ligand than F Co+3 4s0 3d6
[Co(H2O)6]+2 Weak Field -0.8Δ0 Co+2 4s0 3d7
[Rh(H2O)6]+3 weak Field -0.4Δ0 Rh+3  
 
T h u s space w i t h space r e f e r e n c e space t o space d a t a space 3 r d space o p t i o n space i s space t h e space m o s t space a p p r o p r i a t e space o n e.
Answered by Sumit Chakrapani | 09 Apr, 2019, 01:32: PM

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