The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively:

, , ,

Question

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively:

, , ,

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Strategy:
 Identify the oxidation state, field strength of the ligands, resulting spin state, and finally the number of unpaired electrons for each complex.

Step 1: Evaluate each complex
- :  (). Strong field  forces low spin: . 1 unpaired electron.
- :  (). Weak field  forces high spin: . 5 unpaired electrons.
- :  (). Weak field  forces high spin: . 4 unpaired electrons.
- :  (). Strong field  forces low spin: . 2 unpaired electrons.

Step 2: Compile the sequence
The sequence is 1, 5, 4, 2.

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