2022-06-222022-06-22195813740247https://hdl.handle.net/10657/9912Carcinogenic activities of certain of the alkyl tetracyclic erratic hydrocarbons have been assigned. These assigiments are based on published experimental data and on criteria established in this investigation. The ultra-violet absorption spectra of the alkyl derivatives of benz(a) anthracene and chrysene are reported. The frequencies and the molecular extinction coefficients of the bands are given; and in addition, the general band system features are discussed. Spectral shifts of the maximum of each band system (with respect to the parent compound) produced by alkyl substitution are gives. An approximate vibrational band analysis is reported. A correlation of the carcinogeaic activity and the wavenumber difference of the maadsass of the two principal band systems is established for the compounds studied.application/pdfenThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.Thesisreformatted digital