Tell how you could distinguish between the pair of compounds by their infrared spectra: compound a ch3ch2ch2n(ch3)2 and compound b ch3ch2ch2nh2 a. compound a will show an nh absorption while compound b will not. b. compound b will show an nh absorption while compound a will not. c. the infrared spectra will be the same for both compounds. d. there is no way to differentiate between the two compounds using ir.