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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Apr 2008 22:34:42 IST
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Mn+ ---> 3d 5 4s1 now when CO is present, effective configuration = 3d 6 4s 0
So 3 lone pairs for back bonding with vacant orbital of C in CO
Fe ---> 3d6 4s2 in presence of CO , eff config = 3d 8 i,e 4 lone pairs for back bonding
Cr ----> 3d5 4s1 effective config = 3d 6
so 3 lone pairs for back bonding
V - ---> 3d 4 4s2 so eff. config = 3d 6 ; again 3 lone pairs for back bonding
Thus max back bonding in Fe(CO)5.
So CO bond order lowest.
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