We investigate general two-temperature, advective, transonic accretion discs around black holes (BH), in the presence of radiative processes. We found that for a given set of
constants of motion infinite solutions exist (unlike in case of one-temperature flows, which
possess a unique solution). In two-temperature regime, the number of unknowns is more than the number of equations which makes the model degenerate. We removed this degeneracy by employing second law of thermodynamics, where the solution with the maximum entropy is the correct solution. In this way we constrain a unique solution and spectrum, for a
given set of constants of motion. Any wrong choice of solution would lead to
misinterpretation of the system. We found that the luminosity and efficiency of a shocked solution is always more than a solution without a shock, although no unique feature related to accretion shock could be identified. For systems having low accretion rates, bremsstrahlung is important, signature of which is seen at higher frequencies. This bremsstrahlung is a dominant source of hard photons which causes Compton heating in the system, while synchrotron emission
provides soft photons which cause inverse-Comptonization, visible as a hard power law in
the spectrum. Luminosity along with efficiency increases with the increase in accretion rate
of the system, irrespective of the mass of the BH, while the spectral index hardens. On the
other hand for a given accretion rate, with the increase in mass of the BH, the luminosity
increases, the spectra becomes broader with increasing central BH mass, but the efficiency and variation of spectral index variation is marginal.