Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Which of the following has longest C — O bond length?. (Free C — O bond length in CO is 1.128 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
The greater the negative charge on the carbonyl complex, the more easy it 
would be for the metal to permit its electrons to participate in the back bonding, the higher would be the 
bond order and simultaneously there would be larger reduction in the C—O bond order. Thus, 
has the lowest C—O bond order means the longest bond length.
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