Amonst the following, the metal carbonyl species having the highest vCO stretching frequency is · ABC26IN0520

Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Metal Carbonyls · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

Amonst the following, the metal carbonyl species having the highest $v_{\mathrm{CO}}$ stretching frequency is

(a)$\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$

(b)$\mathrm{Cr}(\mathrm{CO})_{6}$

(c)$\left[\mathrm{V}(\mathrm{CO})_{6}\right]^{-}$

(d)$\left[\mathrm{Fe}(\mathrm{CO})_{4}\right]^{2-}$

Answer

Answer: A ✓ checked by 4AB · confidence high

Explanation

The cation [Mn(CO)₆]⁺ has the least back-bonding and the highest ν(CO) (~2090 cm⁻¹) (a).

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