i just need 2.47 answered

2.47 Predict the key IR absorption bands whose presence would allow each compound in pairs (a), (c), (d), (c), (g), and (i) from Problem 2.46 to be distinguished from each other. 2.48 The IR spectrum of propanoic acid (Fig. 2.16) indicies that che absorption for the O - H stretch of the carboxylic acid functional group is due to a hydrogen-bonded form. Draw the structure of two propanoic acid molecales showing how they could dimerize via hydrogen bonding. (a) (f) (b) OH or (c) or (g) or (d) or (h) Hexane, CH3(CH2)4CH3, or nonane, CH3(CH2)7CH3 (c) or (i) or