Spectroscopy

Question 1

Carboxylic acid PPM?

Answer 1

10-12

Question 2

Aldehyde PPM?

Answer 2

9-10

Question 3

Benzene-R PPM?

Answer 3

6.5-8.5

Question 4

Acyl PPM?

Answer 4

4.5-6.5

Question 5

CH2-X PPM?

Answer 5

3-4

Question 6

OCH3 PPM?

Answer 6

2-2.5

Question 7

H tertiary carbon PPM?

Answer 7

1.4

Question 8

H secondary carbon PPM?

Answer 8

1.1

Question 9

Primary carbon H PPM?

Answer 9

0.9

Question 10

What wavelenghts does UV Vis spectroscopy occur at?

Answer 10

200nm - 330nm

Question 11

At what wavelengths does π-π* transitions occur and are they forbidden or not?

Answer 11

~200nm and Not forbidden

Question 12

At what wavelengths does n-π* transitions occur and are they forbidden or not?

Answer 12

~300nm and they are forbidden

Question 13

What does π-π* indicate about a structure?

Answer 13

That it has π bonding therefore is a conjugated system or an aromatic system.

Question 14

If you have n-π* what do you expect?

Answer 14

Potentially and aldehyde or a ketone, but NOT a acid, amid or ester.

Question 15

3600cm-1

Answer 15

OH Free non H-bonded is sharp

Question 16

3500-3000

Answer 16

OH H bonded, broad.

N-H Usually broad amine or amide

Question 17

3300

Answer 17

TRIPLEBOND-CH

Question 18

3500-2500

Answer 18

COOH Broad, OH bonded.

Question 19

2350

Answer 19

CO2

Question 20

2200

Answer 20

C2 ME alkyne

Question 21

1750-1690

Answer 21

RCHO Aldehyde confirmed by a C-H peak at 3100-2700 ketones don’t have this!

Question 22

RC(=O)OR`

Answer 22

Ester, confirmed with C-O peak at 1300-1000

Question 23

1760-1710

Answer 23

Acid w peak at 3500-2500 and C-O peak at 1300-1000

Question 24

1700-1690

Answer 24

Amide, confirmed with peak at 3500-3000

Question 25

1600

Answer 25

Aromatic

Question 26

1300-1000

Answer 26

C-O

Question 27

850-700

Answer 27

C-H AROMATIC

Question 28

R-CH3

Answer 28

8-35

Question 29

R-CH2-R

Answer 29

15-50

Question 30

R-(R)CH-R

Answer 30

20-60

Question 31

CR4

Answer 31

30-40

Question 32

TRIPLEC

Answer 32

65-85

Question 33

=C

Answer 33

100-150

Question 34

C-I

Answer 34

0-40

Question 35

C-BR

Answer 35

25-65

Question 36

C-Cl

Answer 36

35-80

Question 37

C-N

Answer 37

40-60

Question 38

RC(=O)N

Answer 38

165-175

Question 39

RC(=O)OR

Answer 39

165-175

Question 40

COOH

Answer 40

175-185

Question 41

RCOH

Answer 41

190-200

Question 42

C=O

Answer 42

205-220

Question 43

BENZENE

Answer 43

110-170

Question 44

3100-2700

Answer 44

NON AROMATIC C-H Sharp strong for sp3, weak for sp2