The correct order of the number of unpaired electrons in the given complexes is:
(A) (B) (C) (D) (E)

Question

The correct order of the number of unpaired electrons in the given complexes is:
(A)  (B)  (C)  (D)  (E)

Canvas Classes · Accepted Answer

Strategy:
 Calculate the exact number of unpaired electrons () for each complex to establish the correct increasing order.

Step 1: Find  for each complex
- (A) :  (), strong field  low-spin  1 unpaired.
- (B) :  (), weak field  high-spin  5 unpaired.
- (C) :  (), weak field  high-spin  4 unpaired.
- (D) :  (). Due to inner 3d availability, it forms  with   3 unpaired.
- (E) :  ()  0 unpaired.

Step 2: Order from lowest to highest
0 (E) < 1 (A) < 3 (D) < 4 (C) < 5 (B).
Sequence: E < A < D < C <

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