JEE Main & Advanced Chemistry GOC Question Bank Critical Thinking

  • question_answer Total number of isomers of \[{{C}_{6}}{{H}_{14}}\] are [IIT-JEE 1987; DPMT 1983; CPMT 1991; MNR 1990; MP PET 1995; UPSEAT 2001]

    A) 4

    B) 5

    C) 6

    D) 7

    Correct Answer: B

    Solution :

      1. \[\underset{\text{n}-\text{hexane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}}}\,\] 2. \[\underset{\text{2}-\text{methyl}\,\text{pentane}}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}}}\,\] 3. \[\underset{\text{3}-\text{methyl}\,\text{pentane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\underset{\,\,\,C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}}}\,\] 4. \[\underset{\text{2,3}-\text{Dimethyl}\,\text{butane}}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}}}\,\] 5. \[\underset{\text{3}-\text{methyl}\,\text{pentane}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\underset{\,\,\,C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}}}\,\]

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