I need help deciphering these NMR and IR. We had to determine what specific alde

Q: I need help deciphering these NMR and IR. We had to determine what specific alde

Interpretation of spectra IR 2976, 2940 cm-1 for sp3 -C-H stretch 2850 cm-1 for aldehyde 1720 cm-1 for C=O stretch -- 1H NMR 1.13 ppm (t, 3H) for CH3 next to CH2 2.42 ppm (q, 2H) for CH2 between CH3 and C=O I do not see a peak at 9.9-10 specific for aldehyde -CH -- 13C NMR 8 ppm for CH3 carbon 35 ppm for CH2 carbon 213 ppm for C=O carbon -- Compound structure (If an aldehyde), CH3-CH2-CHO propanal

ID: 567808 • Letter: I

Question

I need help deciphering these NMR and IR. We had to determine what specific aldehyde or ketone we had from an unknown sample through experimental tests and I am pretty sure I have an aldehyde. However, I need help determining what aldehyde I have. Based on derivative melting points, I suspect it might be acetaldehyde. Do these graphs support that? If not, what other aldehyde could it be? Please explain and make notes on the graphs so I can understand. Thanks!!

IR Spectrum

13C NMR

HNMR

HNMR Extension

%Transmittance 2978 02 294027 1460.02 1414.55 1378.71 1356.88 112081 955.74

Explanation / Answer

Interpretation of spectra

2976, 2940 cm-1 for sp3 -C-H stretch

2850 cm-1 for aldehyde

1720 cm-1 for C=O stretch

1H NMR

1.13 ppm (t, 3H) for CH3 next to CH2

2.42 ppm (q, 2H) for CH2 between CH3 and C=O

I do not see a peak at 9.9-10 specific for aldehyde -CH

13C NMR

8 ppm for CH3 carbon

35 ppm for CH2 carbon

213 ppm for C=O carbon

Compound structure (If an aldehyde),

CH3-CH2-CHO

propanal

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