RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    Which compound has octane number 100?

    A)  2, 2, 4-trimethyl pentane

    B)  iso-heptane

    C)  n-heptane

    D)  n-octane

    Correct Answer: A

    Solution :

     2,2,4-trimethyl pentase is also called iso-octane. Its octane number is 100. \[\underset{2,2,\text{ }4-trimethyl\text{ }pentane}{\mathop{\underset{1}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix}  |2 \\  C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}}\,-\underset{3}{\mathop{C}}\,{{H}_{2}}-\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{\underset{4}{\mathop{C}}\,H}}\,-\underset{5}{\mathop{C}}\,{{H}_{3}}}}\,\]


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