Optical isomerism involves molecules that are non-superimposable mirror images, often due to chirality. These molecules have the same molecular formula and connectivity but differ in the spatial arrangement of their atoms, resulting in mirror-image forms that cannot be aligned perfectly.
Optical isomers are also called enantiomers. They are pairs of molecules that are mirror images of each other but are not identical or superimposable.
Optical activity is the ability of a compound to rotate plane-polarized light. This property is exhibited by chiral molecules, including optical isomers, due to their asymmetric structure.
Molecules exhibiting optical isomerism are typically chiral, meaning they lack an internal plane of symmetry, which causes them to exist as non-superimposable mirror images.
Enantiomers (optical isomers) have identical physical and chemical properties in a symmetrical environment but differ in the direction in which they rotate plane-polarized light: one enantiomer rotates light clockwise (dextrorotatory), and the other counterclockwise (levorotatory).
1. What is the term used to describe molecules that are non-superimposable mirror images and exhibit optical activity?
2. What is the primary cause of geometric isomerism in compounds?
3. What is the primary role or purpose of coordination compounds in chemical and biological systems?
Optical isomerism — definition?
Molecules that are non-superimposable mirror images.
Enantiomers — also called?
Optical isomers.
Optical activity — property?
Rotates plane-polarized light.
Chirality — molecules lacking?
Internal plane of symmetry.
Optical isomers — rotate light?
In opposite directions.
Measurement tool for optical activity?
Polarimeter.
The revision sheet covers the essential concepts of Understanding Isomerism in Chemistry. It is organized by topic to facilitate learning and memorization, with key definitions, explanations and summaries.
Read the full sheet →The quiz contains 10 multiple-choice questions with detailed corrections and explanations for each answer. Ideal for testing your knowledge and identifying gaps.
Take the quiz (10 questions) →Revizly offers 20 interactive flashcards on Understanding Isomerism in Chemistry. Each card presents a question on the front and the answer on the back, enabling active and effective revision based on spaced repetition.
See all 20 flashcards →Import your PDF or paste your course, AI generates sheets, quizzes and flashcards in 30 seconds.