The predominant intermolecular forces present in ethyl acetate, a liquid, are 

Ethyl acetate $\left({\mathrm{H}}_3\mathrm{C}-\underset{\underset{\mathrm{O}}{\mathrm{II}}}{\mathrm{C}}-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{CH}}_3\right)$ is polar molecule and the predominant intermolecular forces present in ethyl acetate liquid is London dispersion and dipole-dipole interaction.