JEE Main & Advanced Chemistry Organic Chemistry: Some Basic Principles & Techniques Question Bank Critical Thinking

  • question_answer IUPAC name of the compound \[C{{H}_{3}}-C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}-\underset{\underset{\underset{\overset{\underset{\begin{matrix}    C{{H}_{3}} & C{{H}_{3}}\,\,\,  \\ \end{matrix}}{\mathop{\hat{\ }}}\,}{\mathop{{}}}\,}{\mathop{CH\,\,\,\,\,\,\,\,}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{CH\,\,\,-\,\,C{{H}_{2}}-C{{H}_{2}}C{{H}_{3}}}}\,\] [Orissa JEE 2003]

    A) 4-isopropyl 1-6-methyl octane

    B) 3- methyl-5-(1?-methylethyl) octane

    C) 3-methyl-5-isopropyl octane

    D) 6-methyl-4-(1?methylethyl) octane

    Correct Answer: B

    Solution :

    \[\underset{\text{3, methyl-5 (1 methyl ethyl) octane}}{\mathop{\underset{1}{\mathop{C}}\,{{H}_{3}}-\underset{2}{\mathop{C}}\,{{H}_{2}}-\underset{\begin{align}   & \hat{\ } \\  & \begin{matrix}    C{{H}_{3}} & C{{H}_{3}}  \\ \end{matrix}\ \ \ \ \ \ \ \ \ \  \\ \end{align}}{\mathop{\overset{C{{H}_{3}}\,}{\mathop{\underset{3}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-}}\,\underset{4}{\mathop{C}}\,{{H}_{2}}-\underset{CH}{\mathop{\underset{|\,5}{\mathop{C}}\,H}}\,-\underset{6}{\mathop{C}}\,{{H}_{2}}-\underset{7}{\mathop{C}}\,{{H}_{2}}-\underset{8}{\mathop{C}}\,{{H}_{3}}}}\,}}\,\]

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