Question

INFRARED SPECTROSCOPY

1. Circle AND label the functional groups in each molecule. Then predict the signal(s) that would result from each functional group in the IR.

PLEASE ANSWER (C) and (D please follow the directions and write neatly

Но, ес -CEC-H

Answer 1

→ Ester functional group Aromatic ring Ester functional group will show C=O stretching around 1750-1730 cm-1 as strong peak Aroamtic ring will give sp2 C-H stretching 3150-3050 cm-1 as strong peak Apart from, sp3 C-H stretching will appear from 3000-2850 cm-1 Ketone functional group ► Alkene Ketone functional group will show C=O stretching around 1725-1705 cm-1 as strong peak Alkene will give sp2 C-H stretching 3100-3000 cm-1 as medium peak Apart from, sp3 C-H stretching will appear from 3000-2850 cm-1 Alkyne functional group HO Cce ► Alcohol group Alkyne will give sp C-H stretching 3300 cm-1 as strong peak and C=C stretching peak appears at 2250-2100 cm-1. Alcohol group will appear as broad peak from 3400-3200 cm-1. Apart from, sp3 C-H stretching will appear from 3000-2850 cm-1 Aldehyde give C=O stretching around 1740-1720 cm-1 as strong peak and Aldehyde C-H stretching appears at 2900-2800 cm-1 >Aroamtic ring will give sp2 C-H stretching 3150-3050 cm-1 as strong peak → C-Cl stretching occurs at 785 -540 cm-1 as strong peak