How an IUPAC name is built: K₃[Fe(CN)₆]IUPAC नाम कैसे बनता है: K₃[Fe(CN)₆]How an IUPAC name is built: K₃[Fe(CN)₆]

NCERT §5.3.2 · Class 12 Chemistry · Chapter 5 · interactive diagram

Parts and what they mean

• K₃[Fe(CN)₆] (K₃[Fe(CN)₆]) — Three K⁺ ions outside; the complex anion [Fe(CN)₆]³⁻ inside the bracket.
• Rule (i): the cation is named first (नियम (i): पहले धनायन का नाम) — Here the cation is K⁺ → “potassium”. You never state how many K⁺ there are.
• Rules (ii)–(iv): ligands with prefixes (नियम (ii)–(iv): उपसर्ग सहित लिगन्ड) — Anionic ligands end in -o: CN⁻ → cyanido. Six of them → hexa. Ligands come alphabetically before the metal.
• Rule (vi): anionic complex → -ate (नियम (vi): ऋणायनी संकुल → -एट) — Fe in a complex anion takes its Latin name: ferrate. (In a cation it would simply be “iron”.)
• Rule (v): oxidation state in Roman numerals (नियम (v): ऑक्सीकरण अवस्था रोमन अंकों में) — Compound is neutral: 3(+1) + x + 6(−1) = 0 → x = +3 → (III).
• Final name: potassium hexacyanidoferrate(III) (अंतिम नाम: पोटैशियम हेक्सासायनिडोफेरेट(III)) — NCERT intext answer 5.2 (iii).

Steps

1. Start from the formula: what is inside the bracket, what is outside?
2. Name the cation first: potassium.
3. Ligands with prefix: hexacyanido.
4. Complex is an anion, so Fe → ferrate.
5. Find the oxidation state: +3 → (III).
6. Join: potassium hexacyanidoferrate(III).

Original diagram drawn by Simple Learning Hub, based on NCERT §5.3.2. Report a mistake