Question

Label please

8 8 8 3084 5459 8 2919 3027 6 2043 887 17313 1 602 2 843 14545 37%5 1250r 12160 11818 15 753.1 BE71 809

Answer 1

The characteristic bonds streaching and bending vibrations are given here from lower value to higher region (4000 cm^-1 to 400 cm^-1)

Broad peak at 3450 cm^-1 is due to O-H streaching vibration.

weak peak at 3384 cm^-1 is due to C $\equiv$ C-H streaching vibration of alkyne bond

medium intensity peak at 3027 cm^-1 is due to C=C-H streaching vibration of aromatic ring

Strong intensity peak at the region of 2949-2854 cm^-1 is due to C-H streaching vibration of alkyl group.

Strong intensity peak at 1731 cm^-1 is due to C=O bond streaching vibration of ester group

peak at 1602 cm^-1 is the medium intensity streaching vibration of aromatic C=C bond

medium intensity peak at 1454 cm^-1 is due to -CH2- bending vibration of alkyl bridge

medium intensity peak at 1376 cm^-1 is due to -CH3 bending vibration of terminal alkyl group

medium intensity several vibration in the region of 1216-1026 cm^-1 is due to C-O-C streaching of ester.

Bellow 1000 cm-1 are the fingerprint region.