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Punjab Medical Punjab - MET Solved Paper-2011

  • question_answer
    \[59g\]of an amide obtained from a carboxylic acid,\[RCOOH\], upon heating with alkali liberated \[17g\] of ammonia. Atomic masses of \[C,\,\,H,\,\,N\]and\[O\]are 12, 1, 14 and 16 respectively. The acid is

    A)  formic acid        

    B)  acetic acid

    C)  propionic acid                  

    D)  benzoic acid

    Correct Answer: B

    Solution :

    \[RCOOH\xrightarrow{{}}\underset{59\,\,g}{\mathop{RCON{{H}_{2}}}}\,\xrightarrow{{}}\underset{17\,\,g}{\mathop{N{{H}_{3}}}}\,\] Since, \[17g\] of\[N{{H}_{3}}\]is liberated from\[59g\]of acid amide, the amide has molecular mass of \[59,\,\,i.e.,RCON{{H}_{2}}=59\]                 \[R+12+16+14+2=59\]                                        \[R+44=59\]                                                 \[R=15\] Hence,\[R\]is\[C{{H}_{3}}\]group and thus acid is\[C{{H}_{3}}COOH\](Acetic acid)


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