COMEDK2023Evening ShiftChemistryCoordination CompoundsActual
Identify the correct IUPAC name of [ CoCl ₂( NO ₂)( NH ₃)₃]
Options
- ATriamminedichloridonitrito- N - cobalt ( III )
- BTriamminedichloronitrito-O-cobaltate(III)
- CDichlorotriamminenitrito- N - cobalt ( II )
- DDichloridotriamminenitrito-O-cobaltate(II)
Correct answer
A. Triamminedichloridonitrito- N - cobalt ( III )
Step-by-step solution
The coordination compound is [CoCl₂(NO₂)(NH₃)₃] . First, determine the oxidation state of the central metal atom, Cobalt (Co). Let the oxidation state be x . The ligands are Cl⁻ (charge -1), NO₂⁻ (charge -1), and NH₃ (neutral, charge 0). The complex is neutral, so the sum of charges is zero: x + 2(-1) + 1(-1) + 3(0) = 0 , which gives x - 3 = 0 , so x = +3 . Next, name the ligands in alphabetical order. The ligands are ammine ( NH₃ ), chlorido ( Cl⁻ ), and nitrito-N ( NO₂⁻ ). There are three ammine ligands, so use t