Chapter 2

Question 1

What is degree of unsaturation?

Answer 1

It is the number of pi bonds and/or rings in a molecule

Question 2

What are constitutional isomers?

Answer 2

Molecules with the same molecules but different shapes

Question 3

What is the formula for calculating the degree of unsaturation from molecular formula?

Answer 3

DOU = ((2C+2) - (# of H) + Group 5 - Group 7 ) /2

Add 1H for group 5 like N as they make 3 bonds- 1 in place of H that should have initially been there plus and extra H, which would look like CH-NH2

Remove 1H for group 7. As they form a single bond like Cl

Question 4

What information does mass spectrometry tell you?

Answer 4

It gives information about the mass of compounds and the fragments from which it is formed

Question 5

How does mass spectrometry work?

Answer 5

1) molecules are ionized (made into charged species) and fragments

2) Ions are separated based on mass depending on their mass-to-charge ratio (m/z)

Question 6

What is the most important peak in mass spectrometry and why does it represent ?

Answer 6

Molecular ion peak, it represents mass of the compound

Question 7

What is spectroscopy?

Answer 7

It is the measurement of the interaction between molecule and electromagnetic radiation.