The order of the M-C bond strength in the following species is (Atomic number for Cr=24, Mn=25, Ti=22, Co=27) · ABC26IN0765

Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallics – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Hard

The order of the $\mathrm{M}-\mathrm{C}$ bond strength in the following species is (Atomic number for $\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Ti}=22$, $\mathrm{Co}=27$ )
$\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$$\left[\mathrm{Mn}(\mathrm{CO})_{6}\right]^{+}$$\left[\mathrm{Ti}(\mathrm{CO})_{6}\right]^{2-}$$\left[\mathrm{Co}(\mathrm{CO})_{4}\right]^{-}$
IIIIIIIV
(a)II $>$ I $>$ IV $>$ III
(b)I $>$ III $>$ II $>$ IV
(c)III $>$ IV $>$ I $>$ II
(d)III $>$ I $>$ II $>$ IV
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
M–C strength follows back-bonding: [Ti(CO)₆]²⁻ (III) > [Co(CO)₄]⁻ (IV) > Cr(CO)₆ (I) > [Mn(CO)₆]⁺ (II) (c).

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