Question:
Identify a ligand with lowest field strength among the following.
Identify a ligand with lowest field strength among the following.
Show Hint
In the spectrochemical series, halides are weak field ligands and Br- is weaker than OH-.
Updated On: Oct 1, 2026
- \(\text{Br}^-\)
- \(\text{OH}^-\)
- en
- \(\text{H}_2\text{O}\)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
The spectrochemical series arranges ligands by crystal field splitting power: \(\text{I}^- < \text{Br}^- < \text{Cl}^- < \text{F}^- < \text{OH}^- < \text{H}_2\text{O} < \text{NH}_3 < \text{en} < \text{CN}^-\).
Step 2: Compare:
Of the four ligands given, bromide is at the weak end, \(\text{OH}^-\) comes after the halides, \(\text{H}_2\text{O}\) is stronger and en is stronger still. So \(\text{Br}^-\) has the lowest field strength.
Final Answer:
Bromide is the weakest field ligand here, option (A). \[ \boxed{\text{Br}^-} \]
The spectrochemical series arranges ligands by crystal field splitting power: \(\text{I}^- < \text{Br}^- < \text{Cl}^- < \text{F}^- < \text{OH}^- < \text{H}_2\text{O} < \text{NH}_3 < \text{en} < \text{CN}^-\).
Step 2: Compare:
Of the four ligands given, bromide is at the weak end, \(\text{OH}^-\) comes after the halides, \(\text{H}_2\text{O}\) is stronger and en is stronger still. So \(\text{Br}^-\) has the lowest field strength.
Final Answer:
Bromide is the weakest field ligand here, option (A). \[ \boxed{\text{Br}^-} \]
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