The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are : A. It is red in colour. B. It has a high solubility in water at pH =9. C. The Ni ion has two unpaired d-electrons. D. The N - Ni - N bond angle is almost close to 90^ . E. The complex contains four five-membered metallacycles (metal containing rings). Choose the correct answer from the options given below :
C. B, C and E Only
Statement A is incorrect as the complex is yellow-green, not red. Statement B is incorrect because the complex shows low solubility in water, especially at neutral pH. Statement C is incorrect because Ni(II) in square planar geometry has all d-electrons paired (d^8 configuration), not unpaired electrons. Statement D is correct regarding the N-Ni-N bond angle being approximately 90° in square planar geometry. Statement E is correct as the complex contains two five-membered metallacycles (chelate rings) per dimethylglyoxime molecule. The incorrect statements are B, C, and E.
Related: Chemistry — Coordination Compounds · All PYQ Banks