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Which of the following statements is CORRECT regarding organometallic compounds? (I) CH3-Mg-Br (Grignard reagent) is organometallic because it has a Mg-C bond. (II) K[PtCl3(C2H4)] (Zeise's salt) is organometallic because it contains a Pt-C bond via pi-coordination. (III) CH3-Li (methyllithium) is organometallic because it has a Li-C bond.

1. Only I and III are organometallic; Zeise's salt is not
2. Only I is organometallic
3. All three (I, II, and III) are organometallic compounds
4. Only Zeise's salt is organometallic because the metal is a transition metal

Correct answer: All three (I, II, and III) are organometallic compounds

Solution

An organometallic compound is defined by the presence of at least one direct metal-carbon (M-C) bond, whether sigma or pi. CH3MgBr has a Mg-C sigma bond. CH3Li has a Li-C sigma bond. Zeise's salt K[PtCl3(C2H4)] has a Pt-C pi-interaction through the pi-electrons of ethylene acting as a ligand. All three satisfy the definition and are correctly classified as organometallic compounds.

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