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The octahedral complex of a metal ion M3+ with four monodentate ligands L1 , L2, L3 and L4 absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is
(JEE Main 2014)
- a)L4 < L3 < L2 < L1
- b)L1 < L3 < L2 < L4
- c)L3 < L2 < L4 < L1
- d)L1 < L2 < L4 < L3
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
The octahedral complex of a metal ion M3+with four monodentate ligands...
Coloured regions of visible light (VIBGYOR) are arranged in the increasing order of wavelength or decreasing order of energy
This suggests that L4 will absorbs higher energy wavelength followed by L2, L3 and L1
Since, higher absorbed energy corresponds to greater extent of crystal field splitting and thus, higher field strength of the ligand Hence, the increasing order of ligand strength of the four ligands is
L1 < L3 < L2 < L4
Most Upvoted Answer
The octahedral complex of a metal ion M3+with four monodentate ligands...
Explanation:
In an octahedral complex, the ligand strength is determined by the spectrochemical series, which is based on the ability of a ligand to split the metal d-orbitals in two different ways: eg and t2g. The ligands that produce a greater energy difference between eg and t2g will have a higher ligand strength.
The increasing order of ligand strength for the four ligands L1, L2, L3, and L4 can be determined from the wavelengths absorbed in the visible region:
- L1 absorbs in the blue region (450-490 nm), indicating a weak ligand that does not split the d-orbitals significantly.
- L2 absorbs in the green region (490-570 nm), indicating a ligand that splits the d-orbitals moderately.
- L3 absorbs in the yellow region (570-590 nm), indicating a ligand that splits the d-orbitals more than L2.
- L4 absorbs in the red region (620-750 nm), indicating the strongest ligand that splits the d-orbitals the most.
Therefore, the increasing order of ligand strength for L1, L2, L3, and L4 is:
L1 < l2="" />< l3="" />< />
Hence, option B is the correct answer:
L1 L3 L2 L4
In an octahedral complex, the ligand strength is determined by the spectrochemical series, which is based on the ability of a ligand to split the metal d-orbitals in two different ways: eg and t2g. The ligands that produce a greater energy difference between eg and t2g will have a higher ligand strength.
The increasing order of ligand strength for the four ligands L1, L2, L3, and L4 can be determined from the wavelengths absorbed in the visible region:
- L1 absorbs in the blue region (450-490 nm), indicating a weak ligand that does not split the d-orbitals significantly.
- L2 absorbs in the green region (490-570 nm), indicating a ligand that splits the d-orbitals moderately.
- L3 absorbs in the yellow region (570-590 nm), indicating a ligand that splits the d-orbitals more than L2.
- L4 absorbs in the red region (620-750 nm), indicating the strongest ligand that splits the d-orbitals the most.
Therefore, the increasing order of ligand strength for L1, L2, L3, and L4 is:
L1 < l2="" />< l3="" />< />
Hence, option B is the correct answer:
L1 L3 L2 L4
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The octahedral complex of a metal ion M3+with four monodentate ligands L1, L2, L3 and L4 absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is(JEE Main 2014)a)L4 < L3 < L2 <L1b)L1< L3 < L2 <L4c)L3< L2< L4<L1d)L1< L2< L4<L3Correct answer is option 'B'. Can you explain this answer?
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