Coordination Compounds 2 Question 37

####39. Among the following metal carbonyls, the CO bond order is lowest in

(a) [Mn(CO)6]+

(b) [Fe(CO)5]

(c) [Cr(CO)6]

(d) [V(CO)6]

(2007,3M)

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Answer:

Correct Answer: 39. he

Solution:

  1. Greater the extent of dπpπ back bonding, smaller will be the bond order of CO bond in metal carbonyls. InFe(CO)5, there is maximum number of valence shell electrons ( d-electrons), greatest chances of pπdπ back bonding, lowest bond order of CO bond.


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