A) chain isomerism
B) position isomerism
C) geometrical isomerism
D) optical isomerism
E) tautomerism
Correct Answer: E
Solution :
Urea shows tautomerism as: \[\underset{keto\text{ }form}{\mathop{N{{H}_{2}}-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-N{{H}_{2}}}}\,\underset{enolic\text{ }form}{\mathop{NH=\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C}}\,-N{{H}_{2}}}}\,\]
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