Lab 11: Stereoscopic Identification of Organic Compounds Flashcards
How many nuclear spin states are allowed for the H nucleus?
two
H nuclei located near electronegative atoms tend to be _____ relative to H nuclei which are not.
deshielded
Which region of the electromagnetic spectrum has the highest frequency?
x-ray
Which region of the electromagnetic spectrum has the longest wavelength
radio
What type of information does infrared spectroscopy give?
the functional groups present
Which of the given compounds would be expected to show a strong, board infrared absorption band at about 850 cm-1?
(CH3)2CH(CH2)2NH2
because of the nitrogen?
What type of electromagnetic radiation is absorbed by the sample in MS?
trick question - no electromagnetic radiation is absorbed in MS
What information does the index of hydrogen deficiency provide from a mass spectrum?
The information about the number of rings and the number of pi bonds in a molecule or compound
Where would you expect to find the molecular ion peak on a mass spectrum of benzene?
78 m/e
Which type of spectrometry results in the destruction of the sample?
MS
An ___ molecular ion peak usually indicates the presence of an ___ number of ___ atoms in the molecule
odd
odd
nitrogen
Various chemical bonds can be identified on an IR by their
location, intensity, and shape
What is the most likely explanation for the presence of low-intensity peaks after the molecular ion peak in mass spectra?
these are isotopic variations
Where would you expect to see an adsorption of carbonyl functional group in the IR?
1700
The height of the peak in MS is proportional to
the relative abundance of the ion
