Answer
(Z)-1-phenylprop-1-en-2-ol (enol 1) will predominate at equilibrium as its double bond is conjugated with the benzene ring which makes it more stable than 3-phenylprop-1-en-2-ol (enol 2).
Work Step by Step
Conjugated systems are more stable than non-conjugated due to factors such as delocalization of charge through resonance and hybridization energy, in other words, delocalization lowers the overall energy of the molecule and increases stability.
