NEET 2012 Chemistry question

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

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

Answer: (2)

Solution

In , Ni is (). For there are not two vacant orbitals available for hybridisation without pairing beyond what ammonia gives, so the complex uses the outer , and orbitals () and is an outer-orbital (high-spin)

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Question ID VK-091142