JEE Main & Advanced Chemistry GOC Question Bank Critical Thinking

  • question_answer Keto-enol tautomerism is found in [IIT-JEE 1988; MADT Bihar 1995]

    A) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-H\]

    B) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}\]

    C) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\]

    D) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\]

    Correct Answer: C

    Solution :

      \[\underset{\text{(Keto}\,\text{form)}}{\mathop{{{C}_{6}}{{H}_{5}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}}}\,\,\text{and}\,\underset{\text{(enol form)}}{\mathop{{{C}_{6}}{{H}_{5}}-\overset{OH}{\mathop{\overset{|\,\,\,\,\,\,}{\mathop{C=}}\,}}\,}}\,C{{H}_{2}}\] \[\underset{\text{(Keto form)}}{\mathop{{{C}_{6}}{{H}_{5}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}}}\,\,\]and \[\underset{\text{(enol form)}}{\mathop{{{C}_{6}}{{H}_{5}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-CH=\underset{OH}{\mathop{\underset{|\,\,\,\,}{\mathop{C\,\,\,}}\,}}\,-C{{H}_{3}}}}\,\]

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