Organic analysis (P2+P3)

Question 1

Why can’t a high resolution mass spectrometer tell the difference between propan-1-ol and propan-2-ol?

Answer 1

same m/z for molecular ion peak so the molecular mass will be exactly the same.

Question 2

Why does C have a relative molecular mass of 12.00000?

Answer 2

12C is the standard reference

Question 3

What does the OH bond in alcohols look like on the mass spec?

Answer 3

1 finger profile
test tube
(state the bond length)

Question 4

What does the OH bond carboxylic acids look like on the mass spec?

Answer 4

4 finger profile
jagged
(state the bond length)

Question 5

What does a C=O bond look like on the mass spec?

Answer 5

sharp spike (state the bond length)

Question 6

What is the fingerprint region?

Answer 6

the area of the spectrum that is below 1500cm-1.