4AB › Chemistry PYQ › CSIR-NET › December 2011 › Q64Q64 · CSIR-NET Chemistry, December 2011 Paper: CSIR-NET December 2011 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: 18 Electron Rule · Marks: 2 · Difficulty: Medium
The correct combination of metal, number of carbonyl ligands and the charge for a metal carbonyl complex $[\mathrm{M(CO)_x}]^{z-}$ that satisfies the 18 electron rule is
(a) $M=T i, x=6, z=1$
(b) $M=V, x=6, z=1$
(c) $M=C o, x=4, z=2$
(d) $M=M o, x=5, z=1$
Answer Answer: B ✓ checked by 4AB · confidence high
Explanation [V(CO)₆]⁻: 5 + 12 + 1 = 18. Ti: 4 + 12 + 1 = 17; [Co(CO)₄]²⁻ = 19; [Mo(CO)₅]⁻ = 17.
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