Question

When one CO group is replaced by PPh3 in [Cr(CO)6], which one of the following statements is
TRUE?
(A) The Cr-C bond length increases and CO bond length decreases
(B) The Cr-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 1

options A is answer of these questions

Answer 2

Hii Arun,

◆ Answer -

(C) The Cr-C bond length decreases and CO bond length increases

◆ Explanation -

• In [Cr(CO)6], one CO group is replaced by PPh3 to form [Cr(CO)5(PPh3)].
• When this happens, strength of C-Cr bond increases with decrease in bond-length.
• This is compensated by increase in bond length of CO.

* CO = Carbon monoxide

* PPh3 = Triphenylphosphine

Hope this helped you. Thanks for understanding..