Coordination Compounds 2 Question 38
40. If the bond length of $CO$ bond in carbon monoxide is $1.128$ $ Å$, then what is the value of $CO$ bond length in $Fe(CO) _5$ ?
(a) $1.15$ $ Å$
(b) $1.128$ $ Å$
(c) $1.72$ $ Å$
(d) $1.118$ $ Å$
(2006)
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Answer:
Correct Answer: 40. (a)
Solution:
- In $CO$, bond order $=3$. In metal carbonyls like $Fe(CO) _5$, due to $d \pi-p \pi$ back-bonding, bond order of $CO$ decreases slightly therefore, bond length increases slightly.
BETA
