Polymers

Let's analyze the given options:Paramagnetic behaviour (Option a):
The number of unpaired electrons determines paramagnetism. The electronic configurations are:
Since Mn has the maximum unpaired electrons (5), it should be the most paramagnetic. However, Fe has only 4 unpaired electrons, meaning Mn should be more paramagnetic than Fe . The given order is incorrect. Ionic size (Option b):
Across a period, ionic size decreases due to increasing nuclear charge. The given order is correct because Mn is the largest and Ni is the smallest. Stability in aqueous solution (Option c):
The stability of transition metal ions in aqueous solution generally increases as the oxidation state increases. The given order is correct. Oxidation states (Option d):
The correct order of oxidation states is:
Since Mn shows the highest number of oxidation states, the given order is correct.

Final Answer: Option (A) does not represent the correct order.