The neutral complex which follows the 18 -electron rule is · ABC26IN0485
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: 18 Electron Rule · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy
The neutral complex which follows the 18 -electron rule is
(a)$\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \mathrm{Fe}\left(\mathrm{CO}_{2}\right)$
(b)$\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \mathrm{Mo}(\mathrm{CO})_{3}$
(c)$\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right)_{2} \mathrm{CO}$
(d)$\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \mathrm{Re}\left(\eta^{6}-\mathrm{C}_{6} \mathrm{H}_{6}\right)$
Answer
Answer: D ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
Electron counts: CpFe(CO)₂ 5+8+4 = 17; CpMo(CO)₃ 5+6+6 = 17; Cp₂Co 19; (η⁵-Cp)Re(η⁶-C₆H₆) 5+7+6 = 18.
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