Table of Contents
NMR spectroscopy is useful for determining the type and number of _______ atoms in organic molecules.
(d) hetero atoms
What is the multiplicity of the methylene hydrogens of a carbon that is attached to a methyl group and to a methyl group and to a methoxy group?
Each of the following compounds has a singlet in its 1H NMR spectrum. Which compound would have its singlet at the highest frequency?
(b) ethyl methyl ether
(c) ethyl-tert-butyl ether
Which of the following compounds would have the signal for its methylene hydrogens farthest downfield?
(a) ethyl chloride
(b) ethyl iodide
(c) ethyl bromide
(d) ethyl fluoride
How many signals would you expect to see in the 1H NMR spectrum of chlorocyclobutane?
What is the multiplicity of the OH group of an alcohol in a solution that contains a trace amount of acid?
How many signals would you expect to see in the 1H NMR spectrum of butane?
Which of the following will occur farthest downfield?
(a) the hydrogens of benzene
(b) the hydrogens of ethyne
(c) the hydrogens of dimethyl ether
(d) the hydrogens of H COH
How many signals will vinyl chloride have in 1H NMR spectrum?
How many signals does 2,2,4-trimethylpentane have in its 1H NMR spectrum?
How many signals would you expect to see in the 1H NMR spectrum of 2-methylpropene?
Which of the following compounds is frequently used as an internal reference in 1H NMR spectroscopy?
Which of the following describes the 1H NMR spectrum of 1,2-dichloroethane?
(a) one doublet
(b) two triplets
(c) two doublets
(d) one singlet
What is the multiplicity of the CH2, hydrogens in CH3OCH2CH2OCH3?
(a) a singlet
(b) a triplet
(c) a quartet
(d) a doublet
What would be the splitting of the protons on the CH2 groups of butane?
Only one signal is present in the PMR spectra of
(a) C₂H4, C3H6
(b) C₂H6, C5H12
A proton Hb is coupled to four equivalent protons Ha.The multiplicity and relative intensity of lines in the signal Hb is
(a) Doublet, 1: 4:9.
(b) Triplet 1: 4: 6
(c) Quintet, 1: 4: 6: 4: 1
(d) Quartet 1: 4: 6: 4:4.
The compounds showing only a single peak in its PMR spectrum are: Acetone (I), Ether (II), Methyl acetate (III), Dibromoethane (IV), Chlorobromoethane (V).
(a) I, II, IV
(b) II, III, V
(c) I, III, V
(d) III, IV, V
The aldehydic proton appears much downfield in the PMR because the aldehydic proton is
(a) Strongly shielded
(b) It lies in the deshielding zone of the carbonyl group
(c) It occurs at 10 8 ppm
The actual value of nuclear spin depends on
(a) Mass number
(b) Atomic number
(c) Both a and b
(d) Shielding effect
The different types of energies associated with a molecule are __________
a) Electronic energy
b) Vibrational energy
c) Rotational energy
d) All of the mentioned
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