IR Functional groups

Question 0

C–[triple bond]–C

Answer 0

~2260-2100

Medium to weak intensity

Question 1

C–[triple bond]–N

Answer 1

~2260-2220

Medium intensity

Question 2

C==C

Answer 2

~1680-1600

Medium intensity

Question 3

C==N

Answer 3

~1650-1550

Medium intensity

Question 4

Benzene ring

Answer 4

~1600 and ~1500-1430

Strong to weak intensity

Question 5

C==O

Answer 5

~1780-1650

Strong intensity

Question 6

C–O (alcohol/ether)

Answer 6

~1050

Question 7

C–N

Answer 7

~1230-1010

Medium intensity

Question 8

OH (alcohol)

Answer 8

~3650-3200

Strong, broad intensity

Question 9

OH (carboxylic acid)

Answer 9

~3300-2500

Strong, very broad intensity

Question 10

NH

Answer 10

~3500-3300
Medium, broad intensity
Primary amines produce two NH peaks, secondary amines only one, tertiary none.

Question 11

Sp3 C–H

Answer 11

~2950-2850

Question 12

Sp2 C–H

Answer 12

~3100-3010

Question 13

Sp C–H

Answer 13

~3300

Question 14

C–O (carboxylic acid)

Answer 14

~1250

Question 15

C–O (ester)

Answer 15

~1250 and ~1050