Organic Analysis 3.3.6

Question 1

What is mass spectrometry used for

Answer 1

To determine the molecular formula of a compound

Question 2

What is the role of a magnetic field in a mass spectrometer

Answer 2

Deflects ions

Question 3

Why is high resolution mass spectrometer useful

Answer 3

It is useful when identifying Compounds that appear to have the same Mr when rounded to the nearest whole number

Question 4

What is the base peak in a mass spectrometer and what does thus represent

Answer 4

Tallest peak in spectrum represents the most stable + abundant ion during fragmentation

Question 5

Which peak on a mass spectrometer helps determine the structure of a compound

Answer 5

Fragment peaks

Question 6

When infrared radiation is absorbed by covalent bonds in moelcules, what does it increase
Whar does it do to the bonds

Answer 6

It increases their vibrational energy
Absorbed infrared radiation makes bonds vibrate with stretching or bending motion
Causes distance between atoms with a dipole moment to increase so there’s a stronger absorption of IR radiation

Question 8

What does the amount of vibrations depend on
This means that every bond vibrates at its own unique——. INFRARED RADIARION absorption valies he’ll to identify particular bonds and therefore functional groups

Answer 8

Bond length
Bond strength

Question 10

IR spectra Samsung notes

Answer 10

🧃

Question 11

In a infrared radiation spectra, what is the fingerprint region caused by?
What is it used for?
Where is this region found?

Answer 11

Complex vibrations
The fingerprint region is unique for each compound so it can be used to distinguish between very similar Compounds
Fingerprint region can be found between 1500cm-¹ and 400cm-¹

Question 12

Why type of bond absorbs most ir radiation
Single, Double or Triple and explain in terms of bond length and strength

Answer 12

Triple
Shortest and strongest