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No correlation exists between the (R) and (S) designation and the direction of rotation of planepolarised light. Justify the statement. |
Answer» Solution :The rotation of a compound, `[(+) or (-)]` is something that we measure in the laboratory with a polarimeter and it depends on how the molecule interacts with light. On the other hand, the (R) and (S) designation is our own artifical way of describing how the atoms or groups are ARRANGED in space around a chiral CENTRE, i.e., the configuration of a particular chirality centre. Therefore, no necessary correlation exsists between the (R) and (S) designation and the direction of rotation of plane-polarised light. DEXTROROTATORY or (+)- compounds may have R or S configuration. Similarly, LEVOROTATORY or (-)-compounds may have R or S configuration.  .
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