derivation of wiens displacement law and wiens distribution law from thermodynamic principle.but not from plancks law
What you write is correct. However, quantum theory isn't necessary for Wien's law. Wien's law is a result of classical thermodynamics. IIRC, it's one of the amazing things that all (or most) of the results of classical thermodynamics applied to black bodies are correct. Only classical statistical mechanics is wrong, and has to be replaced by quantum statistical mechanics. It's rare to find the derivation from classical thermodynamics nowadays, but the "ancients" knew it, and I assume that Planck knew it. Wannier's book has this marvellous derivation, which I've read, but cannot reproduce off the top of my head.This gives the obviously wrong result because of the well-known Rayleigh-Jeans UV catastrophy.
The answer is that we have to consider quantum theory, and this adds the additional universal quantity ##\hbar## of dimension erg s to the game.
Yes, I'm referring to Wien's displacement law that can be derived from classical thermodynamics. The correct spectrum requires quantum mechanics, and was first derived by Planck.So there seems to be no way to get the correct Planck spectrum without quantum theory.
Wien's displacement law, of course, holds for both Wien's and Planck's spectrum.