IsomerismHard
Question
In which pair of following tautomers called as Diad system −
Options
A.H − O − C ≡ N ⇔ O = C = N − H
B.H − C ≡ N ⇔ C 
N − H
N − HC.CH3 − CH2 − CH = O ⇔ CH3 − CH = CH − OH
D.CH3 − COCH2COOC2H5 ⇔ CH3 − C = CH − COOC2H5
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