(d) Urea shows tautomerism as O OH $\ \ \ \ \ \ \ \ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel$ $NH_{2}\ –C - NH_{2} \leftrightharpoons NH = C - NH_{2}\$ keto form enolic form
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Ph.D. in Physics with 19+ years of teaching experience.