The CORRECT order of the CO stretching vibrational frequency is · ABC26IN0491
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Hard
The CORRECT order of the CO stretching vibrational frequency is
(a)$\left[\mathrm{Ti}(\mathrm{CO})_{6}\right]^{2-}>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}>\mathrm{CO}>\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
(b)$\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]>\mathrm{CO}>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}>\left[\mathrm{Ti}(\mathrm{CO})_{6}\right]^{2-}$
(c)$\mathrm{CO}>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}>\left[\mathrm{Ti}(\mathrm{CO})_{6}\right]^{2-}>\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$
(d)$\mathrm{CO}>\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]>\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}>\left[\mathrm{Ti}(\mathrm{CO})_{6}\right]^{2-}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
More negative charge means more back-donation and a lower ν(CO). Free CO (2143) > Cr(CO)₆ (2000) > [V(CO)₆]⁻ (1860) > [Ti(CO)₆]²⁻ (1750 cm⁻¹) (d).
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