6) The structure C 20 H 32 O has 5 degrees of unsaturation. Structure A might be reasonable (the C=O absorbance) but we would expect NaBH4 to reduce the ketone to an alcohol. Since NaBH4 does not affect lambda max, we can rule it out. Likewise we would expect the ketone in structure B) to be reduced by NaBH4 and since it is conjugated with the aromatic ring, this would affect lambda max [benzene rings are unaffected by Pd/C and H2 under normal conditions]. We can rule out C) because its UV absorbance should be affected by hydrogenation with Pd/C and H2. This leaves us with D, which has 5 degrees of unsaturation and no reactions that would affect its absorption maximum.
Professor Starkey, I am taking Organic Chemistry online this semester and I stumbled across these lectures and I bought a subscription. But my question is, can you tell me what lectures would correspond with my text book chapters? I have tried to compare the contents and sub titles of the lectures with my textbook but i havent figured it out yet. My book is "Organic Chemistry"- 9th edition by Francis A. Curey and Robert M. Giuliano. ISBN #-9780073402741
I can send the chapter titles also if you can not pull them up by that information.
LiAlH 4 contains wt% hydrogen, thereby making LAH a potential hydrogen storage medium for future fuel cell -powered vehicles . The high hydrogen content, as well as the discovery of reversible hydrogen storage in Ti-doped NaAlH 4 ,  have sparked renewed research into LiAlH 4 during the last decade. A substantial research effort has been devoted to accelerating the decomposition kinetics by catalytic doping and by ball milling .  In order to take advantage of the total hydrogen capacity, the intermediate compound LiH must be dehydrogenated as well. Due to its high thermodynamic stability this requires temperatures in excess of 400 °C, which is not considered feasible for transportation purposes. Accepting LiH + Al as the final product, the hydrogen storage capacity is reduced to wt%. Another problem related to hydrogen storage is the recycling back to LiAlH 4 which, owing to its relatively low stability, requires an extremely high hydrogen pressure in excess of 10000 bar.  Cycling only reaction R2 — that is, using Li 3 AlH 6 as starting material — would store wt% hydrogen in a single step (vs. two steps for NaAlH 4 which stores about the same amount of hydrogen). However, attempts at this process have not been successful so far. [ citation needed ]