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Question

Which of the following statement is true about back bonding in metal carbonyls, [M(CO)x]?

A
Bond order of MC and CO decreases
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B
Bond order of MC and CO increases
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C
Bond order of MC increases and CO decreases
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D
Bond order of MC decreases and CO increases
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Solution

The correct option is C Bond order of MC increases and CO decreases
Synergic bonding interactions are present in metal carbonyls. The sigma bond is formed when lone pair of electrons of carbonyl carbon is donated to vacant orbital of metal. To form a pi bond, an electron pair donated from filled metal d -orbital to vacant anti-bonding pi orbital of CO. This involves lateral overlap of orbitals. Due to this bond order of CO decreases. Thus, the bond order of MC increases and bond order of CO decreases.

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