Question

Unknown A-32 Molo Mass 2 1. (1 pt) Draw structure of the unknown in the box at the right Line Drawing 2. (0.5 pt) Use the numbers provided on the C NMR spectrum to label each carbon in your structure. 3. (0.5 pt) Assign the signals labelled on the IR spectrum. B Unknown: 8-43 Molar Mass: 88 g/mol 2 3 4 4. (1 pt) Draw structure of the unknown in the box at the right. Line Drawing 5. (0.5 pt) Use the numbers provided on the "C NMR spectrum to label each carbon in your structure 6. (0.5 pt) Assign the signals labelled on the IR spectrum A Conclusion (0.25 pt): Individual work means work done by one person. Therefore, the grade sheet must be your own work in your own calculations, graphs, answers to questions and conclusion FOR TA USE ONLY Conclusion: OO 2.

Answer 1

Using all this information we get to the structure 4 aĆ-36 I-J-I of I-U-I na a Adding the hydrogens to this gives A = C-H stretch HC-c-9 - CH B = C=0 stretch 4 2 1 2 <NMR O A B A IR This structure has 4 carbons, loxygen, & 8 hydrogens. Molar mass = 4x12 + 1x16 + 8x1 = 48 +64 +8 - 72 g/mol Note: IR & NMR do not show any alkene. Po IR alkene range 1450-1650 cm 13C NMR alkene 80-140 ppm. There are no peaks in this region.