Question

Spectrum 1460 * TRANSPETTANCE 1120 TLCT D 0821 0862 esti TTTTT 1sbe llwid sample between all plate HAVENUMBERS 99. Copyright 1994 Spectrum D NULLDISHA 1637 LCE TTTTTTTT capillary file between salt plates AVGUBERS Corrie 1993

Each spectrum corresponds to one of the IR molecules. Match each spectrum to the correct molecule.

Answer 1

1. Benzamide : structure H

• 1660 cm​​​​​-1 ( C=O stretching frequency)
• 1400 cm​​​​​-1 ( C-N stretching frequency )
• 3380 cm​​​-1 ( N-H stretching frequency )

2. pentanal : structure E

• Around 1700 cm​​​​​-1 (C=O stretching frequency)
• Around 2750 and 2850 cm​​​​​-1 ( C-H of aldehyde group )
• Around 2900 cm​​​​​-1 ( C-H stretching frequency of other carbons )

3. Ester : structure C

• Around 1750 cm​​​-1 ( C=O stretching frequency )
• Around 1100 to 1200 cm -1 ( C-O stretching frequency )
• Around 2900 cm​​​​​-1 ( C-H stretching frequency )

4. Phenyl acetlyene : structure G

• Around 1400 to 1600 cm​​​​​-1 ( C=C for aromatic carbons stretching frequency )
• Around 3200cm-1 ( C-H of terminal alkyne stretching frequency )
• Around 2250 cm​​​​​-1 ( C triple bond C stretching frequency)

5. Phenol Ester : Structure A

• Around 1750 cm​​​-1 (C=O stretching frequency )
• Around 1100 to 1200 cm​​​​​-1 ( C-O stretching frequency )
• Around 3300 cm​​​​​-1 ( O-H stretching frequency )

6. Propanoic acid: structure I

• Around 1710 cm​​​​​-1 ( C=O stretching frequency)
• Around 1200 cm​​​​​-1 (C-O stretching frequency)
• Around 2500-3400 cm​​​​​-1 ( O-H stretching frequency )

7. 4methoxyphenol : structure J

• Around 1400-1600cm-1 ( C=C for aromatic carbon )
• Around 1100-1200 cm​​​​​-1 ( C-O stretching frequency )
• Around 3300 cm​-1 (O-H stretching frequency )

8. p-Toulidine : structure B

• Around 3400cm-1 ( N-H stretching frequency )
• Around 1400-1600cm-1 ( C=C for aromatic carbon stretching frequency)
• Around 3000cm-1 ( =C-H stretching frequency)
• Around 2900cm-1 (-C-H stretching frequency)

9. 4-hydroxy3-methyl2butanone : structure F

• Around 3300 cm​​​​​-1 ( O-H stretching frequency)
• Around 1700cm-1 ( C=O stretching frequency )
• Around 1100-1200 cm​​​​​-1 (C-O stretching frequency)
• Around 2900cm-1 (-C-H stretching frequency)

10. Cyclohexene : structure D

• Around 2900cm-1 ( C-H stretching frequency)
• Around 3000 cm​​​​​-1 ( =C-H stretching frequency)
• Around 1600cm-1 (C=C stretching frequency)