RAJASTHAN PMT Rajasthan - PMT Solved Paper-2010

  • question_answer
    The incorrect IUPAC name is

    A) \[\underset{\text{2-methyl-3-butanone}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,\]

    B)        \[\underset{2,\,\,3-\text{dimethylpentane}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix}  || \\  C{{H}_{2}} \end{smallmatrix}}{\mathop{C}}\,H-\underset{\begin{smallmatrix}  | \\  C{{H}_{2}}C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,\]

    C)        \[\underset{\text{2-pentyne}}{\mathop{C{{H}_{3}}-C\equiv C-C{{H}_{2}}-C{{H}_{3}}}}\,\]

    D)        \[\underset{\text{2-bromo-3-chloro-butane}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  Cl \end{smallmatrix}}{\mathop{C}}\,H-\underset{\begin{smallmatrix}  | \\  Br \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,\]

    Correct Answer: A

    Solution :

    \[\overset{1}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\overset{1}{\mathop{C}}}\,-\underset{\begin{smallmatrix}  || \\  C{{H}_{3}} \end{smallmatrix}}{\overset{3}{\mathop{C}}}\,H-\overset{4}{\mathop{C}}\,{{H}_{3}}\] Correct IUPAC name is 3-methyl-2-butanone


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