IR Spectra

Question 1

C-H stretch position

Answer 1

2990-2800 cm-1
Found in Alkanes and Aldehydes

Question 2

C-H bend position

Answer 2

1480-1420 cm-1
1395-1340 cm-1
Found in Alkanes

Question 3

=C-H stretch position

Answer 3

3100-3000 cm-1
Found in Alkenes and Aromatics

Question 4

C=C stretch position

Answer 4

1680-1620 cm-1 in Alkenes
1620-1440 cm-1 in Aromatics

Question 5

=C-H bend position

Answer 5

995-680 cm-1
Found in Alkenes and Aromatics

Question 6

≡C-H stretch position

Answer 6

3310-3200 cm-1
Found in Alkynes

Question 7

O-H stretch position

Answer 7

3650-3550 cm-1 in Alcohols
3200-2500 cm-1 in Carboxylic Acids

Question 8

C-O stretch position

Answer 8

1300-1000 cm-1
Found in Alcohols, Esters, and Carboxylic Acids

Question 9

N-H stretch position

Answer 9

3550-3250 cm-1
Found in Amines and Amides

Question 10

C≡N stretch position

Answer 10

2280-2200 cm-1 in Nitriles

Question 11

C=O stretch position (Saturated)

Answer 11

1740-1720 cm-1 in Saturated Aldehydes
1750-1705 cm-1 in Saturated Ketones
1765-1735 cm-1 in Saturated Esters
1725-1700 cm-1 in Saturated Carboxylic Acids

Question 12

C=O stretch position (conjugated)

Answer 12

1715-1680 cm-1 in Conjugated Aldehydes and Carboxylic Acids
1700-1650 cm-1 in Conjugated Ketones
1730-1715 cm-1 in Conjugated Esters

Question 13

C=O stretch position (Amides)

Answer 13

1700-1630 cm-1

Question 14

NO2 stretch position

Answer 14

1570-1490 cm-1 in symmetric nitro compounds
1390-1300 cm-1 in asymmetric nitro compounds