I. What is the most imptant strong bond stretch to look for in IR spectroscopy t
ID: 1031878 • Letter: I
Question
I. What is the most imptant strong bond stretch to look for in IR spectroscopy to distinguish between an alcohol and a phenol (e.g., benzyl alcohol and p-cresol)? Provide the specific type of bond and the location (in em-i) that goes along with it. Do this for each compound How would you use C NMR to distinguish between benzyl alcohol and p-cresol? Draw the structures and list the approximate ppm ranges of the signals you would expect next to each carbon. How would you use DEPT-135 to distinguish between benzyl alcohol and p-cresol? Draw the structures and list the approximate ppm ranges of the signals you would expect next to each carbon and whether each signal is positive, negative, or disappears relative to the carbon-13 spectrum. If you did C2, then you just need to put a +,-, or 0 next to each carbon. .Explanation / Answer
Question.1) There is difference in IR peak of phenol and p-cresol due to CH3 group attached with sp2 hybridised carbon atom of benzene ring in cresol. This CH3 group show IR peak at nearly 1400cm^-1 (approx) . This band is absent in phenol. This technique work for every problem similar to this one.