Spectroscopy

Question 1

What is the main purpose of reading IR spectra?

Answer 1

To locate different functional groups in the molecule

Question 2

What is the main purpose of reading MS spectra?

Answer 2

Determining the molecular weight and potential isotopes in the molecule

Question 3

What is the main purpose of reading HNMR spectra?

Answer 3

Determining molecular structure from the chemical environments of the hydrogens

Question 4

What is the main purpose of reading 13C NMR spectra?

Answer 4

Determining the carbon structure from their chemical environments

Question 5

Each peak in a spectra corresponds to..

Answer 5

A unique environment

Question 6

A “tongue” peak around 3400-3200 could correspond to…

IR

Answer 6

A hydroxyl group (-OH)

Question 7

A “sword” peak around 1630-1800 could correspond to…

IR

Answer 7

A carbonyl group (C=O)

Question 8

How can you determine if double bonds are present?

IR

Answer 8

Looking around 3000 cm-1, Alkene C-H bonds are slightly above and Alkane C-H bonds are slightly below

Question 9

A peak around 2050-2200 might indicate…

IR

Answer 9

A triple bond (C≡C or C≡N)