Among the following metal carbonyls, ${\rm{C}} - {\rm{O}}$ bond order is lowest in

$\left[ {{\rm{Fe}}{{\left( {{\rm{CO}}} \right)}_5}} \right]$

${\left[ {{\rm{Mn}}{{\left( {{\rm{CO}}} \right)}_6}} \right]^ + }$

$\left[ {{\rm{Cr}}{{\left( {{\rm{CO}}} \right)}_6}} \right]$

${\left[ {{\rm{V}}{{\left( {{\rm{CO}}} \right)}_6}} \right]^ - }$

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NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Among the following metal carbonyls,

\mathrm{C} - \mathrm{O}

bond order is lowest in

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Correct option: B

\left[ {\mathrm{Fe}{{\left( {\mathrm{CO}} \right)}_5}} \right]

Option B ([Fe(CO)5]) is correct because a lower positive or higher negative charge on the metal center increases back-bonding, weakening the C-O bond. Since Fe has no charge, it has the lowest backbonding among the negatively and positively charged species.

NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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