14. The oxidation number (O.N.) and coordination number (C.N.) of chromium in the coordination compound [Cr(en)2Br2]NO2 are ___ and ___, respectively. A. O.N. = +2 C.N. = 4 B. O.N. = +2 C.N. = 6 C. O.N. = +3 C.N. = 4 D. O.N. = +3 C.N. = 6 I know the answer is D. I just need a deep explanation please!

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Coordination Chemistry

It is a part of chemistry, in which the study of compounds that have central atoms surrounded by molecules or ions, known as ligand, is known as coordination chemistry.