The reaction of phenyl acetic acid with CH3MgBr gives CH4.
The reaction of phenyl acetic acid with PCl5 gives PhCH2COCl.
The reaction of phenyl acetic acid with NH3, followed by heating gives PhCH2CONH2.
The reaction of phenyl acetic acid with CH3OH in the presence of conc. H2SO4 gives PhCH2COOCH3.