Identify the most stable radical structure.

Can IR spectroscopy be used for quantitative analysis? >No, because IR spectroscopy only records vibrational frequency of bonds. >No, because IR spectroscopy only identifies the types of covalent bonds. >Yes, because the transmittance of the analyte is proportional to concentration. >Yes, because the absorbance of the analyte is proportional to concentration.

5. Good Question. Draw the best Lewis structure for each of the following common solvents. water (H₂O), methanol (CH3OH), formaldehyde (CH₂O), chloroform (CHCl3), acetonitrile (CH3CN), pentane (C5H12).

5. Draw several resonance contributors for the cyanate ion, [OCN]. Circle the two lowest energy contributors. In the actual anion, on which atom does the negative charge primarily reside? Justify your answer.

OCH Draw the molecules on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default.

For each of the following pairs of resonance structures, cirele the one that would make greater contribution to the actual resonance hybrid. OCH, OCH, A- BI E =

12. Provide one other contributing resonance form for structures A, B, and C. Show all electron movement using curved arrows. Between the two structures, circle the higher contributing resonance form. A В C HO.

Two resonance structures are possible for the anion shown. One resonance form is given, but it is incomplete. Complete the given structure by adding nonbonding electrons and formal charges. Draw the remaining resonance structure, including nonbonding electrons and formal charges. Omit curved arrows. Structure A: complete the structure by adding Structure B: draw the remaining resonance structure, nonbonding electrons and formal charges. including nonbonding electrons and formal charges. Rings Erase Select Draw Rings More Erase Select Draw More H // C H. H

Provide the major resonance forms for the molecule shown

Most alkenes absorb at a shorter wavelength than alkadienes. Explain.