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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2011

  • question_answer
    \[C{{H}_{3}}C{{H}_{2}}OH\xrightarrow[step\,I]{C{{l}_{2}}}C{{H}_{3}}CHO\xrightarrow[step\,II]{3C{{l}_{2}}}C{{l}_{3}}CCHO\] In above reactions, the role of \[C{{l}_{2}}\]in step I and step II respectively is

    A)  oxidation, chlorination

    B)  reduction, chlorination

    C)  oxidation, addition

    D)  reduction, substitution

    Correct Answer: A

    Solution :

    \[C{{H}_{3}}C{{H}_{2}}\xrightarrow[Step\,I]{C{{l}_{2}}}C{{H}_{3}}CHO\] The above reaction is an example of oxidation. Due to oxidation, \[-C{{H}_{2}}OH\] group is oxidised to \[-CHO\]group.                 \[C{{H}_{3}}CHO\xrightarrow[Step\,II]{3C{{l}_{2}}}C{{l}_{3}}.C.CHO\] In the second step, chlorination takes place. In chlorination, hydrogen atom changes by chlorine.


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