Q41 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Metal Carbonyls · Marks: 2 · Difficulty: Easy

An organometallic fragment that is isolobal to $\mathrm{CH}_{3}{ }^{+}$is
(a)$\left[\mathrm{Fe}(\mathrm{CO})_{5}\right]$
(b)$\left[\mathrm{Mn}(\mathrm{CO})_{5}\right]$
(c)$\left[\mathrm{Cr}(\mathrm{CO})_{5}\right]$
(d)$\left[\mathrm{Ni}(\mathrm{CO})_{3}\right]^{+}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
CH₃⁺ has one empty frontier orbital; the 16-electron d⁶ ML₅ fragment [Cr(CO)₅] likewise has one empty σ-type orbital. [Mn(CO)₅] (d⁷) is isolobal with CH₃•.

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