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Question

Among the following metal carbonyls, the CO bond order is lowest in:

A
[Mn(CO)6]+
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B
[Fe(CO)5]
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C
[Cr(CO)6]
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D
[V(CO)6]
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Solution

The correct option is B [Fe(CO)5]
(A) Mn+= 3d54s1; in presence of CO, effective configuration =3d64s0.

Three lone pair for back bonding with vacant orbital of C in CO.

(B) Fe0= 3d64s2; in presence of CO, effective configuration= 3d8.

Four lone pair for back bonding with CO.

(C) Cr0= 3d54s1; effective configuration = 3d6.

Three lone pair for back bonding with CO.

(D) V= 3d44s2; effective configuration = 3d6.

Three lone pair for back bonding with CO.

Maximum back bonding is present in Fe(CO)5 therefore, CO bond order is lowest here.
Hence,option B is correct.

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