JEE Main & Advanced Chemistry GOC Question Bank Structural and stereo isomerism

  • question_answer How many isomers of \[{{C}_{5}}{{H}_{11}}OH\] will be primary alcohols [CBSE PMT 1992]

    A) 2

    B) 3

    C) 4

    D) 5

    Correct Answer: C

    Solution :

      \[\underset{\text{Pentan-1-ol}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-OH}}\,\] \[C{{H}_{3}}-O-{{C}_{3}}{{H}_{7}}\] \[\underset{2-\text{Methyl}\,\,\text{butan}-\text{l}-\text{ol}}{\mathop{\overset{4\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}}}\,-\overset{3\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{\overset{2\,\,\,\,\,}{\mathop{CH}}\,\,\,}}\,}}\,-\overset{1\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,-OH}}\,\] \[\underset{2,2-\text{Dimethyl}\,\,\text{propan}-\text{l}-\text{ol}}{\mathop{\overset{3\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}}}\,-\underset{C{{H}_{3}}\,\,\,}{\overset{C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,}{\mathop{\overset{2\,\,\,\,\,\,\,}{\mathop{C\,\,\,-\,}}\,\,}}}\,}}}\,\overset{1\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,-OH}}\,\]

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