NEET 2011 Chemistry question

Which of the following complex compounds will exhibit highest paramagnetic behaviour ? (At. No. : Ti = 22, Cr = 24, Co = 27, Zn = 30)

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

Paramagnetism increases with the number of unpaired electrons ( BM). (1) is : 1 unpaired electron. (2) is : 3 unpaired electrons (the three electrons occupy singly irrespective of ligand strength). (3)

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Question ID VK-090680