A) enantiomers
B) tautomers
C) mesomers
D) diastereomers
Correct Answer: A
Solution :
Key Idea: First define all terms and then find correct answer: Enantiomers: are pair of optical isomers which are related as non superimposable mirror images of each other. They have identical physical and chemical properties except their behaviour towards plane polarized light. (b) Tautomers: are formed by shifting of labile hydrogen atoms. It is a type of structural isomerism. (c) Mesomers: are optical isomers having plane of symmetry. Diastereomers: are optical isomers which cannot be related as non superimposable mirror images of each other. They have different physical and chemical properties. \[\therefore \] d and \[l\]tartaric acids are related as non-superimposable mirror images of each other \[\therefore \] they are enantiomers
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