please help! and could you explain.

Resonance Note: When answering these questions, it is useful to write the value for each C=O signal in your answers. Make sure to draw structures when prompted to. 1. The IR spectrum of acetone has a C=O signal at 1749cm1. Compare this to the C=O signals for compounds 1 and 2 . Why are the C=O signals for 1 and 2 shifted to a different. wavenumber than acetone? Use structures in your answer. Acetone 1 2 2. Compare the C=O signal for compound 3 to the C=O signals for compounds 1 and 2 . How does the signal for 3 differ? Why? Use structures in your answer. 3. Compare the C=O signals for compounds 4,5 , and 6 . How do they differ from one another? Why do these signals differ? Use structures in your answer. 4. Which compound (4,5, or 6 ) has a C=O signal closest to the C=O signal for compound 3? Why are the C=O signals so similar? 5. Compare the C=O signal for compound 7 with the C=O signal for compound 2. How does the signal for 7 differ? Why? Use structures in your answer. 2 7