What are you looking for in the IR spectrum of the product? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a a strong signal at around 3400 cm-1 b a medium intensity signal at around 2250 cm-1 c a strong signal at around 1730 cm-1 d a strong signal at around 1690 cm-1 e a strong signal at around 1600 cm-1