1. Indicate how you could distinguish between the following pairs of compounds b

Question

1.   Indicate how you could distinguish between the following pairs of compounds by using infrared spectroscopy.

a

Butanal

2-Butanone

b

3-Cyclohexenone

2-Cyclohexenone

c

Diethylamine

Butylamine

d

Ethyl Propionate

1-Methyoxy-2-butanone

e

Propionic Acid

Propanol

f

1-Pentyne

1-Pentene

g

1-Methoxy-1-butanol

Methyl Butyrate

  

a

     
  

Butanal

     
  

2-Butanone

  

  

     

  

  

b

     
  

3-Cyclohexenone

     
  

2-Cyclohexenone

  

  

  

  

c

     
  

Diethylamine

     
  

Butylamine

  

  

     

  

  

d

     
  

Ethyl Propionate

  
  

1-Methyoxy-2-butanone

  

  

  

  

  

e

     
  

Propionic Acid

     
  

Propanol

     

  

  

f

     
  

1-Pentyne

     
  

1-Pentene

     

  

  

g

  

  

1-Methoxy-1-butanol

     
  

Methyl Butyrate

   Indicate how you could distinguish between the following pairs of compounds by using infrared spectroscopy.

Explanation / Answer

Butanal as a C-H 2830-2695 for the aldehyde with a C=O stretch at 1700

2-Butanone has a C=O stretch at 1700

2-Cyclohexenone

3-Cyclohexenone

Butylamine
1

C-H bend (ortho) 770-735

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