Functional Group Alkane C-H Alkane C-C Absorption (cm1) 2850-2960 800-1300 3020-

Question

Functional Group Alkane C-H Alkane C-C Absorption (cm1) 2850-2960 800-1300 3020-3100 1640-1680 910 and 990 890 3300 2100-2260 Functional Group Alkyl halide C-Cl 600-800 Alkyl halide C-B 500-600 Alcohol OH Alcohol C-O Arene C-H Absorption (cml) Functional Group Aldehyde C=0 Ketone C O Ester C-O Amide C-O Carboxv-lic acid C=O Carboxvlic acid O-H Nitrile C Nitro NO2 Absorption (cml) 1730 1715 1735 1690 1710 2500-3100 2210-2260 1540 3400-3650 1050-1150 3030 ne =C-H Alkene C-C Alkene RCH-CH2 Alkene R2C-CH2 Alkyne -H Alkyne C Aromatie ring C- 60-2000 1450-1600 3300-3500 1030-1230 Amine N-H Amine C-N NH2 aCH3CH2CH20% and b CH3CH0%0% What IR absorption would you use to distinguish between the two compounds above? Enter a frequency, or range as lower freq-higher freq, from the table above Which compound will exhibit this absorption? cm

Explanation / Answer

Compound (a) has only cp3 hybridized carbon atoms and hence sp3C-H stretchings will appear in the region 2850-2960 cm-1 (alkane). On the other hand, compound (b) has two N-H bonds which will appear at 2850-2960 cm-1 and 3300-3500 cm-1 (as sharp signal) respectively.

Hence for distinguishing between (a) and (b) signal for NH2 group in compound (b) at 3300-3500 cm-1 are important.

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