alleryThe IUPAC name of $[Co(NH_3)_5Cl]Cl_2$ is:
APentaamminechlorocobalt(II) chloride
BPentaamminechlorocobalt(III) chloride
CTetraamminechlorocobalt(III) dichloride
DHexaamminecobalt(II) chloride
Answer & Solution
Correct answer: B. Pentaamminechlorocobalt(III) chloride
**Inside sphere:** 5 NH₃ + 1 Cl.
**Charge balance:** Co + 5(0) + (-1) = +2 (since two Cl⁻ outside balance +2)
⇒ Co = +3. Naming alphabetically: amm-ine before chloro?
**Actually alphabetical:** 'a' for ammine comes before 'c' for chloro.
**Hence:** pentaamminechlorocobalt(III) chloride.
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