4AB › Chemistry PYQ › CSIR-NET › December 2019 › Q95Q95 · CSIR-NET Chemistry, December 2019 Paper: CSIR-NET December 2019 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Medium
Among the following complexes, the one showing the highest rate of substitution of a CO ligand on heating with one equivalent of $\mathrm{PPh}_{3}$ in decalin, is
(a) $\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \mathrm{Mn}(\mathrm{CO})_{3}$
(b) $\left(\eta^{5}-\mathrm{C}_{5} \mathrm{Ph}_{5}\right) \mathrm{Mn}(\mathrm{CO})_{3}$
(c) $\left(\eta^{5}-\mathrm{C}_{5} \mathrm{Me}_{5}\right) \mathrm{Mn}(\mathrm{CO})_{3}$
(d) ( $\eta^{5}$-indenyl) $\mathrm{Mn}(\mathrm{CO})_{3}$
Answer Answer: D ✓ checked by 4AB · confidence high
Explanation The indenyl effect makes (η⁵-indenyl)Mn(CO)₃ substitute fastest (d).
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