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Coordination Compounds question

2015 · Shift 2 · Q9

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JEE Advanced
Chemistry
Coordination Compounds
2015 · Shift 2 · Q9

Coordination Compounds question

2015 · Shift 2 · Q9

JEE AdvancedChemistryCoordination CompoundsNumerical+3 / −1

In the complex acetylbromidodicarbonylbis(triethylphosphine) iron(II), the number of

Fe-C

bond(s) is

\underline{\hspace{2cm}}

.

Numerical answer

View written solutionFree

Correct answer: 3

Interpret the name of the complex

The complex is:

$\text{acetylbromidodicarbonylbis(triethylphosphine) iron(II)}$

So the ligands attached to iron are:
- acetyl
- bromido
- 2 carbonyl ligands
- 2 triethylphosphine ligands
Identify which ligands form an $Fe-C$ bond

We count only ligands that are directly bonded to iron through carbon.
- Bromido: bonded through $Br$ → no $Fe-C$ bond
- Triethylphosphine, $PEt_3$ : bonded through $P$ → no $Fe-C$ bond
- Carbonyl, $CO$ : bonded through carbon → each gives one $Fe-C$ bond
- Acetyl: in organometallic nomenclature, an acetyl ligand is $-C(O)CH_3$ and it is bonded to the metal through the acyl carbon. Hence it contributes one $Fe-C$ bond.
Total number of $Fe-C$ bonds
- From 2 carbonyl ligands: $2$
- From 1 acetyl ligand: $1$
Therefore,

$\text{Total number of } Fe-C \text{ bonds} = 2 + 1 = 3$
Compare with stored answer

Derived answer = 3

Stored correct answer = 3

They match.

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