An acetal is a combination of what functional groups? Select one: a. an ester and an ether b. an ether and a hydroxyl, bonded to adjacent carbons c. an ether and a hydroxyl, bonded to the same carbon d. two ethers At what frequency in an IR spectrum does the carbonyl group appear? Select one: a. 1050-1020 cm b. 1780-1670 cm C. 3600-3300 cm d. 1650-1600 cm Information Set 16: Multistriatin is a pheromone for the elm bark beetle. -CH3 -CH3 . CH3 Multistriatin The infrared spectrum of a sample of multistriatin shows a strong, broad peak at 3398 cm- and 1708 cm! Which of the following conclusions can be drawn from this information? Select one: a. It forms a stable structure. b. It contains a ring structure. c. It vibrates when exposed to infrared radiation. d. It has been hydrolyzed to a ketone and a di-alcohol