Answer: Stereoisomers (including geometric and optical isomers).
- A Stereoisomers (including geometric and optical isomers)
- B Constitutional (structural) isomers, which differ in connectivity instead
- C Resonance structures of a single fixed arrangement of atoms
- D Tautomers related by a simple proton-shift equilibrium
Correct answer: A. Stereoisomers (including geometric and optical isomers)
Explanation: Stereoisomers have the same connectivity but different spatial arrangements; this includes cis/trans (geometric) and optical isomers.
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.