4AB › Chemistry PYQ › CSIR-NET › December 2017 › Q50Q50 · CSIR-NET Chemistry, December 2017 Paper: CSIR-NET December 2017 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Marks: 2 · Difficulty: Medium
Among the following species isolobal to $\mathrm{CH_2}$ are \[ \begin{array}{ll} \text{A. } \mathrm{CpCr(CO)_2} & \text{B. } \mathrm{CpCu} \\ \text{C. } \mathrm{Ni(CO)_2} & \text{D. } \mathrm{Cr(CO)_4} \\ \text{E. } \mathrm{Fe(CO)_4} & {} \end{array} \]
(a) A, C and E
(b) B, C and D
(c) B, C and E
(d) A, B and D
Answer Answer: C ✓ checked by 4AB · confidence high
Explanation CH₂ has two frontier orbitals and two electrons: isolobal with d¹⁰ ML₂ [Ni(CO)₂], d⁸ ML₄ [Fe(CO)₄] and CpCu (11 + 5 = 16 e). Cr(CO)₄ (14 e) and CpCr(CO)₂ (15 e) have different counts. B, C and E.
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