Question

Suggestions for Solving Organic Spectral Problems Use the mo lecular formula to determine the number of rings and/or double bonds 1. HXN + 1 2 2 2 Formula: Doubles bonds and Rings C - Cyclohexane (C,H12) would be 6 -6+ 1 1 for 1 ring or double bond Benzene (C6H6) would be 6- 3 +1 4;1 ring 3 double bonds Aniline (C6H7N) would be 6- 7/2+½ 1 - 4; 1 ring 3 double bonds 2. If oxygen is present in the molecular formula look in the IR for carbonyl or hydroxyl groups. 3. Scan the proton and, if available, carbon NMR spectra to determine, aromatic, alkene, and alkyl resonance's. 4. IfC3 is available, check to see if the number of carbons in the molecular formula matches the number of signals in the spectra. A spectra with only half the number of carbon signals as carbon atoms indicates a molecule witha plane of symmetry. 5. Check the proton NMR for common coupling patterns such as ethyl, isopropyl, aldehyde protons, methyl, and t-butyl signals. Para isomer of aromatic compounds Vs. ortho and meta. 6. Place all of the pieces of the puzzle together to get the best possible fit of the data available. 7. Good Luck

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Answer 1

Double bond equtaleat fer yo0 4t1- 10 0 2 Coneluefon Only ngae bonds ore preent 28- 299 1124 cm Sp v hreeh Ve-o Mreel Keepmg y a eye on NMR data tollowtrg struebure propeted (-2ppm, 6t, ttplet) b(5ppm, quautet eCth-CH--C 5ymmetric Maleeule