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Which of the following is the best method for preparing aspirin? O OH aspirin . * + Fo . + CHCl3 CI . + . . * + NH2 Which one of the compounds A to E corresponds to the NMR spectra provided below? IH NMR 13C NMR 3H 6H 4H 1H PPM PPM A. B. MA . OD. . Linezolid is an antibiotic used for the treatment of infections caused by Gram-positive bacteria that are resistant to other antibiotics. How many distinct carbon signals are expected in the proton- decoupled 13C DEPT NMR spectrum of this compound? . A. 11 B. 10 C. 13 D. 9 O E. 12 Which one of the following names best describes the highest occupied molecular orbital (HOMO) in a molecule of diboron (B2): ) A. Tg*(2p) B. Out (2p) C. Tu(2p) O D. Ou*(25) O E. og(2p) Which one of the compounds A to E best matches the IR spectrum below? 100 0 4000 3000 2000 1500 1000 500 Wavenumber(cm) . A. NO2 B. = 'N . CEN . c D. . 1