• # 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) ${{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}$

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