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Introduction

Among the fol...

Question

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

A

[M n (C O)_{6}]^{+}

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B

[F e (C O)_{5}]

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C

[C r (C O)_{6}]

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D

[V (C O)_{6}]^{-}

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Solution

The correct option is B $[F e (C O)_{5}]$
(A) $M n^{+} = 3 d^{5} 4 s^{1};$ in presence of CO, effective configuration $= 3 d^{6} 4 s^{0} .$

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, CO bond order is lowest here.
Hence,option B is correct.

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