Question

# Metal carbonyls can have formula $$M (CO)_x)$$, where $$x =$$ number of $$CO$$ units coordinated to metal $$M$$. What is the formula of the carbonyl of $$Fe (26)$$ if $$EAN$$ of $$Fe$$ in metal carbonyl is $$36$$?

A
2
B
3
C
4
D
5

Solution

## The correct option is D 5 The effective atomic number :$$\displaystyle EAN = Z-X+Y$$$$\displaystyle Z=$$ atomic number of iron which is $$26$$.$$\displaystyle X=$$ number of electrons lost during formation of metal ion from its atom which is 0.$$\displaystyle Y=$$ number of electrons donated by the ligands which is $$2x$$ as there are $$xCO$$ ligands and each one donates 2 electrons.$$\displaystyle EAN = 26-0+2x=36$$$$\displaystyle 2x=10$$$$\displaystyle x=5$$Thus, the metal carbonyl is $$\displaystyle Fe(CO)_5$$.Hence, the correct option is D.Chemistry

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