a. An oxygen-containing compound shows an absorption band at ~ 1700 cm-1 and no absorption bands at ~ 3300 cm-1, ~ 2700 cm-1,or ~ 1100 cm-1. What class of compound is it?
b. A nitrogen-containing compound shows no absorption band at ~ 3400 cm-1 and no absorption bands between 1700cm-1 and 1600cm-1. What class of compound is it?