IR Frequencies

Question 1

sp3 C-H

Answer 1

2850 - 2960 (s)

Question 2

sp2 C-H

Answer 2

3010 - 3095 (w - m)

Question 3

O=C-H (aldehyde)

Answer 3

2700 - 2900 (w)

Question 4

sp C-H

Answer 4

3300 sharp (s)

Question 5

N-H

Answer 5

3300-3500 (m)

Question 6

O-H (free)

Answer 6

3590-3600 (s) sharp

Question 7

O-H (normal H-bonded)

Answer 7

3200 - 3600 (s) broad

Question 8

O-H (strongly H-bonded)

Answer 8

2500-3200 (s) broad

Question 9

nitriles (RCN)

Answer 9

2200-2260 (v)

Question 10

alkynes (RC≡CR’)

Answer 10

2150-2260 (w)

Question 11

alkynes (RC≡CH)

Answer 11

2100-2140 (w)

Question 12

Alkenes

Answer 12

1620 - 1680 (v)

Question 13

Enones (C=C-C=O)

Answer 13

1590 - 1640 (s)

Question 14

aromatics: one, two or three of:

Answer 14

1600, 1580, 1500 (v)

Question 15

nitro (NO2)

Answer 15

1560, 1350 (s)

Question 16

Carbonyl group (C=O) Standard

Answer 16

1715 ±10

Question 16

Carbonyl Group (aldehyde - H)

Answer 16

+15

Question 16

Carbonyl Group (anhydride - OCOR)

Answer 16

+35, +110

Question 16

Carbonyl Group (acid chloride - Cl)

Answer 16

+85

Question 17

Carbonyl Group (aryl ketone - Ar)

Answer 17

-25

Question 18

Carbonyl Group (enone C=C)

Answer 18

-35

Question 19

Carbonyl Group (amide - NH2)

Answer 19

-65

Question 20

Carbonyl Group (ester - OR)

Answer 20

+25

Question 21

Carbonyl Group (Carboxylic acid - OH)

Answer 21

0