VMMC VMMC Medical Solved Paper-2009

  • question_answer
    \[2{{C}_{6}}{{H}_{5}}CHO\xrightarrow{NaOH}{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH+{{C}_{6}}{{H}_{5}}COONa\]The same reaction can take place with which ofthe following aldehydes ?

    A) \[C{{H}_{3}}CHO\]

    B)                        \[C{{H}_{3}}C{{H}_{2}}CHO\]

    C)        \[{{(C{{H}_{3}})}_{3}}CCHO\]

    D)        \[{{(C{{H}_{3}})}_{2}}CHCHO\]

    Correct Answer: C

    Solution :

    The given reaction is Cannizaro reaction. It is given by only those aldehydes in which \[\alpha -H\]atom is not present. Hence, \[{{\text{(C}{{\text{H}}_{\text{3}}}\text{)}}_{\text{3}}}\text{C}\text{.CHO}\]due to the absence of \[\alpha -H\]atom gives the Cannizaro reaction as \[2{{(C{{H}_{3}})}_{3}}C.CHO\xrightarrow{\text{Conc}\text{.}\,\text{NaOH}}{{(C{{H}_{3}})}_{3}}C.C{{H}_{2}}OH\] \[+{{(C{{H}_{3}})}_{3}}C.COONa\] \[{{\text{(C}{{\text{H}}_{\text{3}}}\text{)}}_{\text{2}}}\text{CHCHO}\]also give Cannizaro reaction, however in if \[\alpha -H\]atom is present


You need to login to perform this action.
You will be redirected in 3 sec spinner