Answered: CH3 CH3 CH3 CH3 CH3 Н CH3 CH3 С-СН CH3…

CH3 CH3 CH3 CH3 CH3 Н CH3 CH3 С-СН CH3 НаС CHз CH3 Н 4.95 х 10 8 Н Н Н CH3 Н 3.51 х 10 8 3.42 х 10 4 8.32 х 10 8 2.15 х 10 4

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter9: Energy For Today

Section: Chapter Questions

Problem 9E

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Concept explainers

Aromatic Compounds

Aromatic organic compound or aromatic system is an important class of hydrocarbons under the branch of organic chemistry. Aromatic compounds are also called arenas. The definition of aromatic organic compounds can be stated as a class of organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Due to these alternating bonds, a peculiar feature termed as ‘resonance’, that is, delocalization of pi electrons or the electrons is shared within the atoms of the ring which are present in the aromatic compounds. The word ‘aromatic’ includes a Greek word ‘aroma’ which means smell, indicating that they were named as such due to the sweet odor they produce. Many well-known flavors such as vanilla, cinnamon, and few scents from flowers are extracted from aromatic compounds. Benzene with chemical formula C6H6 is a very common aromatic compound that contains six atoms of carbon held in the cyclic ring of alternate double bonds. It is also to be noted that not all aromatic compounds contain benzene ring. This can be explained by Huckel’s rule.

Question

The second-order rate constant (in units of M^-1s^-1) for acid-catalyzed hydration at 25 °C is given for each of the following alkenes:

a.Calculate the relative rates of hydration of the alkenes. (Hint: Divide each rate constant by the smallest rate constant of the series: 3.51 x 10^-8.)

b. Why does (Z)-2-butene react faster than (E)-2-butene?

c. Why does 2-methyl-2-butene react faster than (Z)-2-butene?

d. Why does 2,3-dimethyl-2-butene react faster than 2-methyl-2-butene?

CH3
CH3
CH3
CH3
CH3
Н
CH3
CH3
С-СН
CH3
НаС
CHз
CH3
Н
4.95 х 10 8
Н
Н
Н
CH3
Н
3.51 х 10 8
3.42 х 10 4
8.32 х 10 8
2.15 х 10 4

Definition Definition Organic compounds that contain at least one double bond between carbon-carbon atoms. The general molecular formula for alkenes with one double bond is C n H 2n .

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