Question

Write more stable tautomeric structrues of the following:
(a) Phenol
(b) Methyl-3-oxobutane
(c )Cyclohexan -1,3,5 trione
(d) Butan-2-one
(e )1-Phenyl butan-2- one
(f)
(g). 2-Bicyclo[4.1.0] heptan-2-one
`underset((A))("Glycerol")overset(KHSO_(4))underset({:(" or"),( P_(2)O_(5)),(-2H_(2)O" "):})to(B) overset("Tautomeric form")(hArr)(C)`

Answer 1

a.
b.
c.
d.
(II is less stabel, the exocyclic `(C==C)` bond increases the strain in the cyclopropyl ring.)
The `(C==C)` bond joining two rings is called exocyclic double bond.