3.6- Organic analysis

Question 1

Which peak represents the parent molecule

Answer 1

The molecule that has the largest mz value

Question 2

What is a molecular ion

Answer 2

An ion that has one electron knocked off

Question 3

What is high resolution mass specrometry

Answer 3

HRMS can be used to determine the molecular formula of a compoud from the accurate mass of the molecular ion

Question 4

Why will there be an M peak and an M+2 peak when a compound contains chlorine and bromine

Answer 4

These occur due to the different isotopes of chlorine and bromine, these allow for different peaks

Question 5

What will the ratios of M and M+2 be for chloro ethane and dichloro methane

Answer 5

For chloromethane the ratios will be 3:1

For dicholoroethane the ratios witll be 9:6:1

Question 6

What will the ratios of M and M+2 be for bromomethane and dibromoethane

Answer 6

Bromomethane ratios will be 1:1

Dibromoethane ratios will be 1:2:1

Question 7

What is the fingerprint region

Answer 7

The fingerprint region is the region below 1500 cm-1, it is complicated and contains many signals, picking out the functional group signas is very difficult

Question 8

What are rogue absorptions

Answer 8

They indicate impurities