Directions On the following spectra assign the major peaks

Directions: On the following spectra, assign the major peaks - all the peaks in the characteristic region and any diagnostically useful peaks in the fingerprint region. Then, e assign one of the compounds below to its spectrum. 3 NH2 CEN 01 CECH OH

Solution

Spectrum 11 showing major peak at 2965, 2925 and 2850 indicates alkyl C-H stretchings

A strong peak at 1775 suggests the presence of cyclic ester carbonyl group(C=O)

A sharp peak at 1180 indicates C-O stretching

Thus spectrum 11 corresponds to a cyclic ester 7

Spectrum 12 also showing major peaks of alkyl C-H

A strong peak at 1725 suggests an aldehyde C=O group and the corresponding aldehydic C-H peaks are observed at 2825 and 2725

Thus spectrum 12 corresponds to a aliphatic aldehyde 12