When one CO group is replaced by PPh₃ in [Cr(CO)₆], which one of the following statement is TRUE? · ABC26IN0524
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium
When one CO group is replaced by $\mathrm{PPh}_{3}$ in $\left[\mathrm{Cr}(\mathrm{CO})_{6}\right]$, which one of the following statement is TRUE?
(a)The $\mathrm{Cr}-\mathrm{C}$ bond length increases and CO bond length decreases
(b)The $\mathrm{Cr}-\mathrm{C}$ bond length decreases and CO bond length decreases
(c)The Cr-C bond length decreases and CO bond length increases
(d)The Cr-C bond length increases and CO bond length increases
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
PPh₃ is a better σ-donor/poorer π-acceptor than CO, so more back-donation goes to the remaining CO: Cr–C shortens, C–O lengthens (c).
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