NMR spectroscopy

Question 1

Structure answer for proton NMR spectroscopy for chloroethane

Answer 1

-Peak at 1.0 is due to R-CH3 ( 3 proton environments)
-Triplet because there are 2 adjacent protons
-n+1 rule states 2+1=3
-Peak at 3.1 due to CH2Cl
-Quartet because of 3 adjacent protons

Question 2

What does one peak represent?

Answer 2

-Singlet
-Zero neighbouring protons

Question 3

What is it when there are more than 5 peaks?

Answer 3

multiplet.

Question 4

What is the presence of an ester in NMR spectroscopy.

Answer 4

-Peak at 2 representing HC-C=O
-Peak at 4 representing HC-O

Question 5

What is the definition of a labile proton?

Answer 5

-Protons attached to a oxygen or a nitrogen are called labile protons because they can rapidly be exchanged with other molecules.

Question 6

Test for identifying a labile proton?

Answer 6

-D2O-heavy water, any signal due to O-H, N-H, S-H proton disappears on O-H is exchanged with the D ion D2O