IR Exercise Match the following 10 compounds with the 10 spectra on the followin
ID: 543257 • Letter: I
Question
IR Exercise Match the following 10 compounds with the 10 spectra on the following pages. Label the major diagnostic peaks on each spectrum to receive full credit. CH3 -1-butanol HOCH2CH2CH20% acetophenone O-CH2OH ethyl acetate benzyl alcohol N-methylcyclo- NHCH3 . I-hexene CH2-CHCHpCH2CH2CH3 hexylamine anilineNH 2-pentanone H3C-C-CH2CHCH3 pentane CH3CH-CH2CH2CH3 butyraldehyde H3CHCH2C" Reference Some IR Stretching Frequencies 3400-3250 cm N-H(, 2 amines) 3500-3200 em C-C (alkenes) 1680-1640 cm 1600-1585 cm C-C (aromatics) 1500-1400 cm C-C (aromatics) 1335-1250 cm C-N (aromatic amines) 1250-1020 cm C-N (aliphatic amines) -H (alcohols) mC-H(alkenes, aromatics) 3000-2850 cm C-H (alkanes) 2830-2695 cm C-H (aldehydes) 1750-1665 cm C-O (see discussion on back) 1300-1050 cm1 C-O (alcohols, esters)Explanation / Answer
spectrum 1 - Pentane ,sinc it has a peak for CH at 2970 cm-1 and For c-c stretch at 1480 cm-1
Spectrum 2 - N-methyl cylcohexylamine since it as a peak at 3250 due to NH stretch and a peak at 2985 for CH sstretch and C-N stretch at 1130
spectrum 3 - Butaraldehyde since peas at 2730 and 2880 corresponds to aldehyde C-H stretch and a peak at 2985 due to C-H stretch an a peak at 1720 is to carbonyl group of aldehyde stretch
Spectrum 4 - Acetophenonoe since peak at 3050 is due to aromatic =C-H ; 2975 is for C-H and at 1690 is for conjugated carbonyl group of ketone.
Spectrum 5 - 1-butanol O-H stretch at 3350 and CH stretch at 2980 and C-O stretch at 1080
Spectrum 6 - Benzyl alcohol, as it as stretches at 3350 , 3050, 2965 and 1050 for OH, =CH, C-H and C-O respectively
Spectrum 7 - 2-pentanone since CH stretch at 2985 and carbonyl stretch at 1705
Spectrum 8 - Ethyl acetate, since carbonyl stretch at 1740 and Ch stretch a 2980 and C-O stretch at 1050
Specctrum 9- 1-hexene, peak at 3050 due to =CH stretch and 2990 is due to CH stretch and 1610 is due to C=C
Spectrum 10 - Aniline since two peaks at 3250 nad 3100 are due to primary amine nad 3050 is due to =CH and 2980 is due to CH and a peak at 1620 for C=C
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