Chapter 14: Q14P (page 620)
Without referring to Table 14.1, label the proton or set of protons in each compound that gives the signal at the lowest frequency a, at the next lowest b, and so on.
Short Answer
Step by step solution
Nature of Protons
The protons which are attached to some kind of atoms in its surrounding show a single signal.
Presence of Heteroatoms
The protons which are closely attached to hetero atoms show a higher chemical shift then a normal chain proton.
Presence of functional group
The protons of a functional group or nearby a functional group also show the different chemical shifts.
a. Proponal –proponal has three sets of equivalent protons a stands for the three protons of the methyl group, b stands for the two protons of the methylene group and c stands for one proton attached to the carbonyl group.
b. 2-Oxomethyl-butane – it has five stets of equivalent protons and three protons of methyl group labeled as a.
b stands for 3 protons of methyl group near to oxo-methyl group. C stands for two methylene protons and d for three protons of the oxo-methyl group. E for one proton of second carbon.
c. 1,3-dichloropropane - it has two sets of protons 4 protons near both chloro group and two protons at middle carbon.
d. 3-oxomethyl-pentane – it has four sets of protons. Six protons of both terminals carbon, four protons of second to terminal carbon on both sides. C stand for three carbon oxo-methyl group and d for one-carbon third carbon.
e. Butylmethanoate – it has four sets of identical photons. All carbons have different kinds of protons.
f. 2- methylethoxypropane – because of the unsymmetric structure all carbons have different types of compounds. It has six sets of protons
g. 2-pentanone – it has four set of protons .every carbon is in a different environment because the ketone group is present in the second position.
h. 3- methylmethoxy propane – it has five sets of protons. All carbon has a different kinds of protons.
i. 2-chloro-3-methyl-butane – it has four sets of protons. 2 methyl groups attached to the third carbon are the same else are different.
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