IR Spectroscopy

Question 1

C-C

Answer 1

1200

Question 2

C=C

Answer 2

1660

Question 3

C…C

Answer 3

<2200

Question 4

Isolated C=C

Answer 4

1640 - 1680

Question 5

Conjugated C=C

Answer 5

1620 - 1640

Question 6

Aromatic

Answer 6

1660

Question 7

R-C…C-R’

Answer 7

Weak or absent

Question 8

R-C…C-H

Answer 8

2100 - 2200

Question 9

C-H (sp3)

Answer 9

<3000

Question 10

C=H (sp2)

Answer 10

> 3000

Question 11

C…H (sp)

Answer 11

3300 (sharp)

Question 12

Alcohol O-H

Answer 12

3300 (broad)

Question 13

Acid O-H

Answer 13

3000 (broad)

Question 14

Amine N - H

Answer 14

3300 (broad w/spikes)
One spike - primary (RNH2)
Two spikes - secondary (R2NH)

Question 15

C=O

Answer 15

1710

Question 16

Aldehyde RHC=O

Answer 16

C=O stretch at 1725, saturated C-H stretch <3000 (2 peaks (2710 and 2810)

Question 17

Carboxylic acid

Answer 17

O-H shifted to 3000, overinflated

Question 18

Conjugated C=C for ketones, aldehydes, acids

Answer 18

Lower stretching from 1710 to 1685

Question 19

Ester/Ketone with < 6 membered ring

Answer 19

1735

Question 20

C=N

Answer 20

1660

Question 21

C…N

Answer 21

> 2200