The clustering phenomena and structural peculiarities of partly ordered liquids are of great interest in the scientific community. Partial ordering in monohydric alcohols is due to the intermolecular hydrogen bonding. In this book the processes of hydrogen-bonded clusters formation in monohydric alcohols are analysed by methods of low-temperature matrix isolation and vibrational spectroscopy. An experimental model of structural transformations during the phase transition gas - liquid was constructed.