NMR/IR (Exam 2)

Question 1

What does proton NMR look like?

Answer 1

Upward peaks

Question 2

What does C13 NMR look like?

Answer 2

Upward lines

Question 3

What does APT NMR look like?

Answer 3

Upward and downward lines

Question 4

Important peaks to know in Proton NMR:

Answer 4

~2-2.5 —> benzylic H’s

~6.5-8 —> aromatic H’s

Question 5

Important peaks in C13 NMR:

Answer 5

• less than 100 = sp3 carbons
• greater than 100 = sp2 and sp carbons
• ~100 = sp carbons
  (Carbons with H’s are probably going to be taller peaks)

Question 6

Important peaks in APT NMR:

Answer 6

• pointed up = C’s with no H’s or 2 H’s

- pointed down = C’s with 1 H or 3 H’s

Question 7

Quartet

Answer 7

Grouping of four peaks

Question 8

Triplet

Answer 8

Grouping of three peaks

Question 9

Multiplet

Answer 9

a large grouping of peaks

Question 10

Benzylic

Answer 10

Groups directly attached to a benzene ring