Q46 · CSIR-NET Chemistry, June 2018
Paper: CSIR-NET June 2018 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Easy
The correct of $\mathrm{C}-\mathrm{O}$ bond length is
(a)$\mathrm{H}_{3} \mathrm{B} . \mathrm{CO}>\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}>\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}$
(b)$\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}>\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]>\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}>\mathrm{H}_{3} \mathrm{B} . \mathrm{CO}$
(c)$\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}>\mathrm{H}_{3} \mathrm{B} . \mathrm{CO}>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}<\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
(d)$\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}>\mathrm{H}_{3} \mathrm{B} . \mathrm{CO}>\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
More back-bonding lengthens C–O: [V(CO)₆]⁻ > Cr(CO)₆ > [Mn(CO)₆]⁺ > H₃B·CO (b).
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