The complex that does NOT obey the 18-electron rule is (Given: Atomic numbers of Ti, Mn, Ta and Ir are 22… · ABC26IN0770
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallics – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
The complex that does NOT obey the 18-electron rule is (Given: Atomic numbers of Ti, Mn, Ta and Ir are 22, 25, 73 and 77, respectively)
(a)$\left[\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \mathrm{Ti}(\mathrm{CO})_{4}\right]^{-}$
(b)$\left[\mathrm{TaCl}_{3}\left(\mathrm{PEt}_{3}\right)_{2}\left(\mathrm{CHCMe}_{3}\right)\right]$
(c)$\left[\mathrm{Mn}\left(\mathrm{SnPh}_{3}\right)_{2}(\mathrm{CO})_{4}\right]^{-}$
(d)$\left[\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \operatorname{Ir}\left(\mathrm{CH}_{2}\right)\left(\mathrm{PMe}_{3}\right)\right]$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The Schrock alkylidene TaCl₃(PEt₃)₂(=CHCMe₃) is a 14-electron Ta(V) complex; the others are 18-electron (b).
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