1 & 2

1. Predict the characteristic infrared absorptions of the functional groups in the following molecules. (a) cyclohexene (b) pentan-2-ol (c) pentan-2-one (d) pent-1-yne (e) diethylamine (f) pentanoic acid (g) pentanenitrile (h) ethyl acetate (i) pentanamide 2. Describe the characteristic infrared absorption frequencies that would allow you to distinguish between the following pairs of compounds. (a) 2,3-dimethylbut-2-ene and 2,3-dimethylbut-1-ene (b) cyclohexa-1,3-diene and cyclohexa-1,4-diene (c) and (d) and pentanal pentan-2-one butanamide pentan-3-one (e) CH3(CH2)5CCH and CH3(CH2)6CN (f) and oct-1-yne octanenitrile butanoic acid 3-hydroxybutanal