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Class 12 NEET Chemistry Coordination Compounds
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© examsnet.com
Question : 32
Total: 99
Which of the following has longest C - O bond length ? (Free C - O bond length in CO is
1.128
Å)
[NEET 2016 P1]
[
M
n
(
C
O
)
6
]
+
N
i
(
C
O
)
4
[
C
o
(
C
O
)
4
]
⊝
[
F
e
(
C
O
)
4
]
2
−
Validate
Solution:
👈: Video Solution
F
e
→
–
–
–
C
−
−
−
–
–
–
–
–
–
O
Due to back bonding between metal-carbon bond length of C - O increase (B.O of M-C ↑ B.O of C - C ↓ B.L of C-O ↑) Higher is negative charge on metal, higher is back bonding (synergic effect) so bond length is higher so answer is
[
F
e
(
C
O
)
4
]
2
−
© examsnet.com
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