Question

Integrated Problem 14.63 Ephedrine is a bronchodilator and decongestant obtained from the Chinese plant Ephedra sinica. A concentrated solution of ephedrine gives an IR spectrum with a broad signal between 3200 and 3600 cm 1. An IR spectrum of a dilute solution of ephedrine is very similar to the IR spectrum of the concentrated solution. That is the broad signal between 3200 and 3600 cm is not transformed into a narrow signal, as we might expect for a compound containing an OH group. OH Ephedrine Choose the correct explanation for why the IR spectrum of dilute solution of ephedrine is very similar to the IR spectrum of the concentrated solution. The OH group in ephedrine can engage in vibrational excitation, even in dilute solutions The OH group in ephedrine can engage in asymmetric stretching, even in dilute solutions. The OH group in ephedrine can engage in symmetric stretching, even in dilute solutions. O The OH group in ephedrine can engage in intramolecular hydrogen bonding, even in dilute solutions. 2650585°N 10062