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KVPY Sample Paper KVPY Stream-SX Model Paper-1

  • question_answer
    The enantiomeric excess and observed specific rotation of a mixture containing \[6\,\,gm\left( + \right)-2-\]butanol and 4 (gm) of \[\left( - \right)-2-\] butanol are respectively (If the specific rotation of enentiomerically pure \[\left( + \right)-2-\] butanol is + 13.5 unit).              

    A) 80%, +2.7 unit

    B) 20%, -27 unit

    C) 20%, +2.7 unit

    D) 80%, -27 unit

    Correct Answer: C

    Solution :

    [C] Enantiomeric excess \[=\frac{Excess\,\,of\,\,one\,\,enantiomer\,\,over\,\,other}{Entire\,\,mixture}\times 100\] \[=\frac{6-4}{6+4}\times 100=20\]%


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