Organic Analysis

Question 1

Infrared energy

Answer 1

Infra red energy is absorbed by bonds which makes the bonds vibrate.
The bonds vibrate at the same frequency as the Infra red energy

Question 2

Process of Infrared spectrometer

Answer 2

A beam of IR light conatining a wide range of frequencies is passed through a
sample.
Some of the frequencies of IR light are absorbed by the molecule. Many of the
frequencies are not absorbed, and so pass straight through the sample. The
light that emerges through the other side of the sample is missing the
frequencies which are absorbed.
Once detected, an computer plots a graph of the intencity of the light which
emerges from the sample. This is called TRANSMITTANCE.
The frequency is plotted on the x-axis with the units ‘wavenumbers’ which are
cm-1
.

Question 3

Fingerprint region

Answer 3

Compare the fingerprint region below 1500cm-1 to database to find a match

Question 4

Why does C have a relative molecular mass of 12.00000?

Answer 4

A: 12C is a standard reference

Question 5

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

Answer 5

A: They have the same molecular formula, so their molecular mass will be
exactly the same.