Consider the three organic compounds drawn below. Which of the following statements is (are) true about the IR spectra of I, II, and III?

Question

Quizplus · Accepted Answer

I shows strong absorption at 2950 cm^-1 due to C-H stretching in alkyl groups and at 1700 cm^-1 due to C=O stretching in a carbonyl group. 
II shows strong absorption at 2950 cm^-1 due to C-H stretching in alkyl groups and at 2250 cm^-1 due to C≡C stretching in a terminal alkyne. 
III shows strong absorption at 2950 cm^-1 due to C-H stretching in alkyl groups and a broad absorption from 3200-3600 cm^-1 due to N-H stretching in an amine group. Therefore, statement D is true.

Consider the Three Organic Compounds Drawn Below