The IUPAC name of [Pt(NH3)2Cl(NH2CH3)]Cl is:

🧠 Three Ligands, Three Letters: A, C, M

Cation-naming questions are alphabetical-ordering puzzles. Strip multipliers, sort ligand names by first letter, then re-attach multipliers and metal block.

For $[\mathrm{Pt(NH_3)_2Cl(NH_2CH_3)}]^+$:

• $\mathrm{NH_3}$ → ammine
• $\mathrm{Cl^-}$ → chlorido
• $\mathrm{NH_2CH_3}$ → methanamine

Alphabetical: a → c → m. So: ammine, chlorido, methanamine — in that order.

🗺️ Wire Up the Full Name

Multipliers.

• 2 × ammine → "diammine".
• 1 × chlorido → "chlorido".
• 1 × methanamine → "(methanamine)" (composite ligand, parentheses for clarity).

Oxidation state of Pt. $x + 2(0) + (-1) + 0 = +1 \Rightarrow x = +2$. So Pt(II).

Counter-ion. Outer $\mathrm{Cl^-}$ → chloride (named after the complex cation, separated by a space).

Stitch: diamminechlorido(methanamine)platinum(II) chloride.

⚡ The "Multiplier-Free Sort"

Always sort ligands by the alphabetised stem, ignoring di/tri/tetra prefixes. "Diammine" and "ammine" both alphabetise under 'a'. This rule is what places "diammine" before "chlorido" here even though 'd' > 'c' — the 'di' is invisible to the sort.

⚠️ "Bisammine" Is Always Wrong

Option (4) writes "bisammine". Bis- is reserved for complex ligand names (those containing prefixes themselves, like "bis(ethylenediamine)"). Ammonia is a simple ligand — always "diammine", never "bisammine".

$\boxed{\text{Answer: (1) diamminechlorido(methanamine)platinum(II) chloride}}$