NMR

Question 1

What is the most common solvent used for non polar organic molecules

Answer 1

CCL4

Question 2

Why is TMS (si) used

Answer 2

• it only gives one signal which is further away from all other H signals
• it gives a strong signal so only a small amount needed
• it is non toxic
• it is inert
• low boiling point so can be removed from sample easily

Question 3

What is the most common solvent used for polar organic molecules

Answer 3

CDCl3

Question 4

What does the number of peaks represent

Answer 4

The number of carbon environments

Question 5

What does the integration number tell you

Answer 5

Add them all up
That will tell you the total number of hydrogens in your molecule

Question 6

What is the rule for the splitting pattern

Answer 6

Tells you how many hydrogens attached to the adjacent carbon
- singlet = 0
- doublet = 1
- Triplet = 2
- Quartet = 3

Question 7

Why are CDCL3 and CCL4 used as solvents

Answer 7

Have no H atoms tied to either CDCL3 or CCl4