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JCECE Engineering JCECE Engineering Solved Paper-2015

  • question_answer
    An in saturated hydrocarbon \['A'\] adds two molecules of H^ and on reductive ozonolysis gives butane-1, 4-dial, ethanol and propanone. Give the \[IUPAC\] name of\[A\].

    A)  3-methyl octa-2, 6-diene

    B)  2-methyl octa-2, 5-diene

    C)  2-methyl octa-2, 6-diene

    D)   2-methyl octa-3, 5-diene

    Correct Answer: C

    Solution :

    The structure of compound, \[A\] is \[\underset{\text{(Ethanal)}}{\mathop{C{{H}_{3}}\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}\,=O}}\,+O=\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-\underset{\text{(Butane-1,}\,\,\text{4-dial)}}{\mathop{C{{H}_{2}}-\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}\,=O+}}\,\]                                                 \[\underset{\text{(Propanone)}}{\mathop{O=\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\xrightarrow{{}}}}\,\] \[\underset{(A)\,\,2-methylocta-2,\,\,6-\text{diene}}{\mathop{C{{\overset{8}{\mathop{H}}\,}_{3}}\overset{7}{\mathop{CH}}\,=\overset{6}{\mathop{CH}}\,-\overset{5}{\mathop{C{{H}_{2}}}}\,-\overset{4}{\mathop{C{{H}_{2}}}}\,-\overset{3}{\mathop{CH}}\,=\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{{{C}^{2}}}}\,-C{{H}_{3}}}}\,\]


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