Tutorial 3
NMR
The proton nmr of 2-bromo-2-methylpropane will consist
of...
three quartets and a singlet
two doublets and a singlet
two singlets
one singlet
The proton nmr of 2-bromopropane will consist of...
two doublets and a sextet
a doublet and a septet
a singlet, a doublet and a triplet
a singlet, a doublet and a triplet
The splitting pattern for a signal is found by...
-counting the number of chemically equivalent hydrogen atoms on adjacent atoms
-counting the number of chemically different hydrogen atoms on adjacent atoms
-counting the number of chemically different hydrogen atoms on adjacent atoms
and adding 1
-counting the number of chemically different hydrogen atoms on adjacent atoms and
subtracting 1
Which one of the following statements about protons on O-H groups is incorrect?
-they always produce a doublet
-they always produce a singlet
-they are not taken into account when working out splitting patterns of adjacent protons
-their signal can be removed from its normal location by shaking with deuterium oxide
In a triplet, the relative peak areas are in the ratio...
1:1:1
1:2:1
1:3:1
1:4:1
Which compound has a molecular ion at m/z = 58, an infra red absorption at 1650
cm-1
and just one singlet in its nmr spectrum?
butane
CH3COCH3
CH3CH2CHO
2-methylpropane
Which one of the following hydrocarbons produces an nmr spectrum with more than
one peak?
methane
ethane
butane
cyclobutane
The isomer of C4H8 which produces an nmr spectrum with four different signals is...
CH2=CHCH2CH3
CH3CH=CHCH3
(CH3)2C=CH2
cyclobutane
Which one of the following methods would be best for finding the identity of an
organic compound?
finding the m/z value of the molecular ion in its mass spectrum
its proton nmr spectrum
comparing its infra red spectrum with known examples
measuring its melting point