5. A brief description of four infra-red spectra 1-4 is given below. Using the summary of infrared stretching frequencies below identify which of the following compounds A-D corresponds to which spectrum?

Give your reasoning 7 B -OH A C D Spectrum 1: intense band at 1716 cm', sharp bands at 2979, 2941 and 2908 cm¹ Spectrum 2: sharp bands at 2968, 2940, 2921 and 2844 cm', no other peaks between 1500 and 2500 cm¹¹. Spectrum 3: intense band at 1728 cm', sharp bands at 2969, 2938, 2908 and 2872 cm¹ Spectrum 4: weak band at 1677 cm, broad band at 3340 cm¹, sharp bands at 2972, 2931 and 2917 cm¹