The correct of C-O bond length is- · ABC26IN0268

Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: CSIR NET 2018 · Marks: 2 · Difficulty: Easy

The correct of C-O bond length is-
(a)$\mathrm{H_3B.CO > [Mn(CO)_6]^{+} > [Cr(CO)_6] > [V(CO)_6]^{-}}$
(b)$\mathrm{[V(CO)_6]^{-} > [Cr(CO)_6] > [Mn(CO)_6]^{+} > H_3B.CO}$
(c)$\mathrm{[Mn(CO)_6]^{+} > H_3B.CO > [V(CO)_6]^{-} < [Cr(CO)_6]}$
(d)$\mathrm{[Cr(CO)_6] > [V(CO)_6]^{-} > H_3B.CO > [Mn(CO)_6]^{+}}$
Answer
Answer: B ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation
More π back-donation lengthens C–O. Back-donation grows with negative charge on the metal: [V(CO)₆]⁻ > Cr(CO)₆ > [Mn(CO)₆]⁺; H₃B·CO has no back-donation at all and the shortest C–O. Option 2.

Study loop for Organometallic Compounds

1. Practise the PYQsPrevious-year questions, with answers

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