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Which of the following does not have a metal–carbon bond?

1. Al(OC2H5)3
2. C2H5MgBr
3. K[Pt(C2H4)Cl3]
4. [Ni(CO)4]

Correct answer: Al(OC2H5)3

Solution

Al(OC2H5)3 does not have a metal-carbon bond because the ethoxy group (-OC2H5) is bonded to aluminum through oxygen, not directly to carbon.

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