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Which of the following may be considered to be an organometallic compound?

1. Nickel tetracarbonyl
2. Chlorophyll
3. K3[Fe(C2O4)3]
4. [Co(en)3]Cl3

Correct answer: Nickel tetracarbonyl

Solution

Nickel tetracarbonyl (Ni(CO)4) is an organometallic compound because it contains a metal (nickel) directly bonded to carbon atoms of the CO ligands. The other options do not meet this criterion.

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