Identify the relevant peaks for each of the IR spectra and record the position a

Question

Identify the relevant peaks for each of the IR spectra and record the position and associated functional group for each in the IR tables on the next page.

(use table for both)

List position (cm-1) & functional group 4    1 5 2 6 3 7 Common Name: Benzyl akohol IUPAC: Benzyl akohol BP: 205.00 MP: -15.00 LOR CH 2.2 2.3 24 252.8 2.7 2.8 2.93 3.5 5.5 6 14 15 16 17 181 21 23 25 %80 R 70 N 60 M 50 0.2B 3 R S E 0.6 N 30 E 20 2.0 4500 4400 4200 4000 3800 3800 3400 3200 3000 2800 2800 2400 2200 2000 1800 1600 1400 1200 1000

Explanation / Answer

IR Spectra 1

Benzyl alcohol

Band at 3400 cm-1 is due to hydroxy group streaching

Band at 3050 -3075 cm-1 is due to aromatic CH stretching

Band at 2850 - 2050 cm-1 is due to aliphatic -CH streaching

Band at 1450 and 1500 cm-1 is due to aromatic C=C streaching

Band at 700 cm-1 is due to aromatic CH bending

IR Spectra 2

Benzyl chloride

Band at 3050 - 3075 cm-1 is due to aromatic CH stretching

Weak band at around 2950 cm-1 is due to aliphatic -CH streaching

Band at 1450 and 1500 cm-1 is due to C=C streaching

Band at 710 cm-1 is due to C-Cl streaching

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