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conversion of glucose's open chain form to chair form

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How to understand the chair form of glucose Generally for us it is easier to understand the structure in 2D. But if we have to know about the configuration (arrangement of substituents)  of a molecule in 3D which is already represented on paper in 2D then we have to visualize that molecule in mind in 3D . This visualization helps to understand the correct structure of molecule. So let's go forward for the same.                            Glucose which has the molecular formula=  C 6 H 12 O 6 . It is aldohexose sugar which contains an aldehyde and 5 -OH  groups attached to 5 different carbon.Its linear structure is given below                                                                                                                         D-Glucose Generally glucose does not exist in linear form ,it exist in cyclic form so to convert into cyclic form we have to follow following steps 1- Assign numbers to each carbon according to PRIORITY  2 R