A) enantiomers
B) tautomers
C) mesomers
D) diastereomers
Correct Answer: A
Solution :
Key Idea: First define all terms and then find correct answer: [a] 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 polarised 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. [d] Diastereomers: are optical isomers which cannot be related as non superimposable mirror images of each other. They have different physical and chemical properties. \[\because \] d and \[l\] tartaric acids are related as non-superimposable mirror images of each other they are enantiomers
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