Question

IUPAC NAME OF [CR(H2O)5SCN]2+

Answer 1

IUPAC name of [Cr(H2O)₅SCN]²⁺ is Pentaaquathiocyanatochromium (III)

• Attached species are arranged in alphabetical order. Water is termed as 'aqua'. Prefix 'penta' is used to indicate that there are five molecules of water.
• Thiocyanate has a negative charge and hence its name ends with 'o'.
• Oxidation state of the central atom, chromium, is written in roman numerals at the end, after the name of the metal.