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Phonon spectrum of many superconducting compounds and, especially, high Tchydrides, is broad and rather complicated ,because of presence of highfrequency optical modes. In order to analyze an interplay of optical andacoustic phonon branches,it is convenient to introduce two coupling constants,{\lambda}opt. and {\lambda}ac., along with to characteristic frequencies. Thecorrelation between the value of Tc with this interplay is demonstrated for thefamily of tantal hydrides (TaH2/ TaH4/ TaH6). The problem of upper limit of Tcis discussed. The phenomenon of room temperature superconductivity can beprovided by the electron-phonon interaction and described by the strongcoupling theory.

High Tc Hydrides: Interplay of Optical and Acoustic Modes and Comments Regarding the Upper Limit of Tc