NEET2016Chemistry-Coordination Compounds
NEET 2016 Chemistry Bonding in Metal Carbonyls MCQ Question
Type: MCQ-conceptual-Hard-Class 12
Which of the following has the longest C = O bond length? (Free C = O bond length in CO is 1.128 Å)
A
[Fe(CO)₄]²⁻
B
[Mn(CO)₆]⁺
C
Ni(CO)₄
D
[Co(CO)₄]⁻
Correct Answer
Option A
Detailed Explanation
The bond length increases with increased back bonding. [Fe(CO)₄]²⁻ has the longest bond length due to the highest electron density on the metal, leading to more back bonding.
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