27. Which is the expected product for the reaction of propyne with excess HBr?.A. 1-bromopropaneB. 2-bromopaneC. 2,2-dibromopropaneD. 1,1-dibromopropane28. The following compounds undergo electrophilic aromatic substitution EXCEPTI.A. I and IIB. III and IVC. II and IIID. IIIII.III.IV. 30. In thebecausehydrohalogenation reaction of 1-phenylpropene, only 1-chloro-1-phenylpropane is obtainedA. a more stable carbonium ion is generated from this product.B. a more stable radical intermediate is generated from this product.C. a more stable benzene ring is generated from this product.D. a less stable transition state is generated from this product.

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27. Which is the expected product for the reaction of propyne with excess HBr?. A. 1-bromopropane B. 2-bromopane C. 2,2-dibromopropane D. 1,1-dibromopropane

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter7: Alkynes

Section: Chapter Questions

Problem 7.35P

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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

27. Which is the expected product for the reaction of propyne with excess HBr?.
A. 1-bromopropane
B. 2-bromopane
C. 2,2-dibromopropane
D. 1,1-dibromopropane
28. The following compounds undergo electrophilic aromatic substitution EXCEPT
I.
A. I and II
B. III and IV
C. II and III
D. III
II.
III.
IV.

30. In the
because
hydrohalogenation reaction of 1-phenylpropene, only 1-chloro-1-phenylpropane is obtained
A. a more stable carbonium ion is generated from this product.
B. a more stable radical intermediate is generated from this product.
C. a more stable benzene ring is generated from this product.
D. a less stable transition state is generated from this product.

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