MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

The general formula MA _4 BC represents an octahedral complex with one central metal atom M , four identical ligands A , and two different ligands B and C . Analyzing the given options: [ Pt ( NH _3)( H _2 O )\, Cl _2] is of the type MA _2 BC (where A = Cl , B = NH _3, C = H _2 O ). [ Pt ( NH _3)_4\, ClBr ]^ 2+ is of the type MA _4 BC (where A = NH _3, B = Cl , C = Br ). Pt ( NH _3)_2\, Cl _2 is of the type MA _2 B _2 (where A = NH _3, B = Cl ). [ Co ( NH _3)_4\, Cl _2]^+ is of the type MA _4 B _2 (where A = NH _3, B = Cl ). Thus, [ Pt ( NH _3)_4\, ClBr ]^ 2+ is the example of MA _4 BC type complex, which exhibits geometrical isomerism (cis and trans forms), and these geometrical isomers are diastereoisomers.