The correct order of [FeF6]3–, [CoF6]3–, [Ni(CO)4] and [Ni(CN)4]2– complex species based on the numb — JEE Mains Chemistry Past Papers Chemistry Question

Question

The correct order of [FeF6]3–, [CoF6]3–, [Ni(CO)4] and [Ni(CN)4]2– complex species based on the number of unpaired electrons present is : (A) [Ni(CN)4]2– > [FeF6]3– > [CoF6]3– > [Ni(CO)4] (B) [FeF6]3– > [CoF6]3– > [Ni(CN)4]2– = [Ni(CO)4] (C) [CoF6]3– > [FeF6]3– > [Ni(CO)4] > [Ni(CN)4]2– (D) [FeF6]3– > [CoF6]3– > [Ni(CN)4]2– > [Ni(CO)4]