ln thermodynamic processes which of the following statements is not true?

For an adiabatic process there should not be any exchange of heat between the system and its surroundings. All walls of the container must be
perfectly insulated. In adiabatic changes gases obey Poisson's law, i.e., ${\mathrm{pV}}^{\mathrm{\gamma }}$= constant. In an isochoric process volume remains constant and for isobaric process pressure remains constant.