Bohr assumed that electromagnetic radiation has dual nature which means that radiations have both wave/particle-like properties.
As Rutherford's model fails to explain the hypothetical results regarding the atomic spectrum of elements.
Thus, Bohr worked on atomic spectra by assuming quantized electronic energy levels in atoms.
Drawbacks of Bohr's atomic model:
He could not explain the details of the Hydrogen and Helium atomic spectrum.
He did not explain the splitting of spectral lines in presence of a magnetic field.
The intensity of spectral lines was not explained by him.
He could not explain the Zeeman effect i.e. splitting of spectral lines in Magnetic field as well as the Stark effect i.e. splitting of spectral lines in electric field.