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NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice

Among the following metal carbonyls, the C-O bond order is lowest in

Options

  1. A[ M n ( C O ) 6 ] +
  2. B[ F e ( C O ) 5 ]
  3. C[ C r ( C O ) 6 ]
  4. D[ V ( C O ) 6 ] -

Correct answer

D. [ V ( C O ) 6 ] -

Step-by-step solution

(A) Mn + =3d 5 4s 1 ;in presence of CO, effective configuration=3d 6 4s 0 . Three lone pair for back bonding with vacant orbital of C in CO. (B) F e 0 = 3 d 6 4 s 2 ;in presence of CO, effective configuration = 3 d 8 . Four lone pair for back bonding with CO. (C) C r 0 = 3 d 5 4 s 1 ;effective configuration = 3 d 6 . Three lone pair for back bonding with CO. (D) V - = 3 d 4 4 s 2 ;effective configuration = 3 d 6 . Three lone pair for back bonding with CO. Maximum back bonding is present in F e ( C O ) 5 ​therefore,

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