JEE Main & Advanced Chemistry Hydrocarbons Question Bank Critical Thinking

  • question_answer How many primary, secondary, tertiary and quaternary carbons are present in the following hydrocarbon \[C{{H}_{3}}-CH(C{{H}_{3}})-C{{(C{{H}_{3}})}_{2}}-C{{H}_{2}}-CH(C{{H}_{3}})-C{{H}_{2}}-C{{H}_{3}}\]

    A) Primary-6 Secondary-2 Tertiary-2 Quaternary-1

    B) Primary-2 Secondary-6 Tertiary-3 Quaternary-0

    C) Primary-2 Secondary-4 Tertiary-3 Quaternary-2

    D) Primary-2 Secondary-2 Tertiary-4 Quaternary-3

    Correct Answer: A

    Solution :

     \[\overset{{{1}^{o\,\,\,\,\,\,\,\,\,}}}{\mathop{C{{H}_{3}}}}\,-\underset{\underset{\,\underset{{{1}^{o\,\,\,\,\,}}}{\mathop{\,C{{H}_{3}}}}\,}{\mathop{|\,\,\,\,\,\,}}\,}{\mathop{\overset{{{3}^{o\,\,\,\,}}}{\mathop{CH}}\,}}\,-\underset{\underset{\underset{{{1}^{o}}\,\,\,\,}{\mathop{C{{H}_{3}}}}\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,}}\,}{\overset{\overset{\overset{{{1}^{o\,\,\,\,\,\,\,\,}}}{\mathop{C{{H}_{3}}\,\,\,}}\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{{{C}^{{{4}^{o}}}}-}}}\,\overset{{{2}^{o}}\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,-\underset{\underset{\,\,\underset{\,\,\,{{1}^{o}}}{\mathop{C{{H}_{3}}}}\,}{\mathop{|\,\,\,\,\,}}\,}{\mathop{\overset{{{3}^{o}}\,\,\,}{\mathop{CH}}\,}}\,-\overset{{{2}^{o\,\,\,\,\,\,}}}{\mathop{C{{H}_{2}}}}\,-\overset{\,\,\,{{1}^{o}}}{\mathop{C{{H}_{3}}}}\,\] \[{{1}^{o}}\,\Rightarrow \text{ Primary 6, }{{\text{2}}^{\text{o}}}\Rightarrow \text{Secondary 2}\]\[{{3}^{o}}\,\Rightarrow \text{ Tertiary 2, }{{\text{4}}^{\text{o}}}\Rightarrow \text{Quanternary}\,1\]


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