Question

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1. Find all characteristic peaks for the following molecule based on IR spectrum and correlation IR table. SDBS-NO-1491 IR-NIDA-04320 : KBR DISC HIT-NO-1501 SCORE= C ACETAMIDE CHNO 10D TRANSMETTANCEI! D 4000 2000 2000 1500 1000 HAVENUMERIAI 467 32 457 58 CH3-C-NH2 3348 13 | 1366 41 3173 141151 34 za19 70 1047 81 2301 84 | 1006 01 1681 4 874 60 1 460 44 710 29 1 398 21 564 20 2. Mass spectrum of pentane contains fragmentation peaks: 15, 29, 43. Please show fragmentation structures of pentane which corresponding with signals founded in spectrum.

Answer 1

'The different heaks observed for the given compound can be characterised as V (cm Description 3400 cm'? -N-H I Characterski 3300 cmt 1-N IN-H bood of amide group 2900 cm (-CH₃) Sp3-C-H stretch 1680 cm Vc=0 stretch. Camice) 1400-1500 cm N-H bending Vibration Acetamide amide cao bond has more single bond character That's why it vibrates at a lower frequency. Thus, IR spectra was interpreted. I C5H12 (m/2=72) +CHA (m/2=43) + (m/2=29) CH₂=CH2 + CH₃ (m/2=15) This different fragments were observed is mass spectra of fentane.