Vibronic spectroscopy and intramolecular vibrational relaxation studies were carried out on jet-cooled hydroquinone, p-methoxyphenol, and p-ethoxyphenol using laser-induced fluorescence measurements. The cis and trans isomeric forms of all three compounds exist even under jet-cooled conditions. Hole-burning spectroscopy was used to separate the transitions due to each of them. Vibrational assignments were made with the help of dispersed fluorescence spectra after single vibronic excitations. The fluorescence spectra were also used to deduce the onset of mode mixing, a precursor to IVR. The VR onset in the case of hydroquinone was quite high, i.e., 1650 cm(-1), and it decreased substantially in p-methoxyphenol, It did not decrease any further for p-ethoxyphenol. One of the objectives of this study was to compare the IVR behavior in this series to that in p-alkoxyanilines, or more specifically, to compare the effect of the presence of an -OH group vs an -NH2 group in the para position on IVR.