![What is Enantiomer? [1 Mark Q&A] – qChem+ chemistry featured image illustrating enantiomers as non-superimposable mirror images with chiral molecules, stereochemistry concept, and optical isomerism for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/06/What-is-Enantiomer-1-Mark-QA-–-qChem-The-Home-of-Chemistry-1.webp)
What is Enantiomer?
Optical isomers that are mirror images of each other but non-superimposable, are called enantiomers.
A more complete definition would be:
Optical isomers (i.e. molecules with same molecular formula, same structural formula but acting differently with plane polarized light) that are mirror images of each other but non-superimposable, are called enantiomers.
![What is Stereoisomerism? [1 Mark Q&A] – qChem+ chemistry featured image explaining stereoisomerism, compounds with the same molecular formula and connectivity but different three-dimensional arrangements, including geometrical, optical, and conformational isomerism for HSC, SSC, O Level, AS Level, and A Level Chemistry students.](https://qchemplus.com/wp-content/uploads/2026/09/What-is-Stereoisomerism-1-mark-QA-820x430.webp "What is Stereoisomerism – 1 mark Q&A")
![A detailed educational infographic titled "What is Mole Fraction?" for qChem+, defining it as the ratio of moles of a component to the total moles in a mixture, with a beaker illustration and formulas for components A, B, and C. It features the qChem+ logo from The Quality Corporates Bangladesh Ltd. and a "[1 Mark Q&A]" call-out.](https://qchemplus.com/wp-content/uploads/2026/09/What-is-Mole-Fraction-1-mark-QA-820x430.webp "What is Mole Fraction – 1 mark Q&A")