A2- NMR

Question 1

What isotope of Carbon is used in carbon NMR?

Answer 1

13C

Question 2

What does NMR stand for?

Answer 2

Nuclear Magnetic resonance

Question 3

What are the units used in NMR?

Answer 3

ppm

Question 4

What is deuterium?

Answer 4

isotope of Hydrogen (2H)

Question 5

Why is deuterium used in solutions?

Answer 5

as even number of nucleons, so will not produce a signal

Question 6

What does the area under the peak mean in proton NMR?

Answer 6

amount of protons in that proton environment

Question 7

What is used as a reference in NMR?

Answer 7

tetramethyl saline (TMS)

Question 8

Where are Cs/Hs closer to electronegative elements shifted?

Answer 8

to the left

Question 9

What solvents are used for NMR?

Answer 9

deuterated (H replaced with deuterium)

Question 10

WHat does a triplet tell you about the number of hs on the neighbouring C atom?

Answer 10

2 Hs (n+1)

Question 11

What does the integration trace tell you?

Answer 11

number of protons in that environment

Question 12

Why would reacting an alcohol with D2O remove OH peaks from an H NMR?

Answer 12

OD replaces OH, D has even number of nucleons so does not create a peak

Question 13

Why is TMS used?

Answer 13

• symmetrical so only one C envt
• non-toxic/inert