Which of the following is not a correct statement concerning the Friedel-Crafts acylation of benzene? A. The benzene ring attacks an acylium ion B. The acylium ion is resonance stabilized. C. The acylium ion is often produced from an acyl chloride D. More than one equivalent of Lewis acid must be used.

Which of the following is not a correct statement concerning the Friedel-Crafts acylation of benzene? A. The benzene ring attacks an acylium ion B. The acylium ion is resonance stabilized. C. The acylium ion is often produced from an acyl chloride D. More than one equivalent of Lewis acid must be used.

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter11: Addition To Alkynes

Section: Chapter Questions

Problem 4CTQ

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A certain compound is known to contain an aromatic benzene ring but failed to produce a fragrant yellow solution upon subjecting it to the nitration test. What may be a possible explanation for this? A. The benzene ring is part of a highly conjugated, blue dye molecule. B. The benzene ring contains a strong electron-withdrawing group. C. The benzene ring has no available sites left for electrophilic attack. D. All of the given. Kindly explain your answer in detail.
In the Friedel-Crafts alkylation of benzene, dialkylation is often a significant by-product. In the Friedel-Crafts acylation of benzene, diacylation is not a significant by-product. Which of the following is the primary reason for this difference? a. Acyl cations are more difficult to make with Lewis acids b.Unlike acyl cations, carbocations can undergo rearrangements. c.Alkyl groups activate the ring to further substitution, acyl groups deactivate it. d. Alkyl groups activate the ring to further substitution, acyl groups deactivate it
21. Which of the following solvents is protic? A. acetone B. propyl chloride C. ethanal D. ethanol E. diethyl ether 22. Which of the following statements is generally true for SN1 reactions? A) Complete inversion of configuration occurs. B) These are favored by nonpolar solvents. C)These reactions are favored by polar solvents. D) Reaction rates depend only on the concentration of the nucleophile. E) The mechanism is a one-step back attack. 23. Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product? A) 1-chloropentane B) 2-chloropentane C) 3-chloropentane D) 1-chloro-2-methylbutane E) 1-chloro-3-methylbutane
5. Which of the following is a true statement? A. Electrophile must be electron deficient. B. Steric effect contributes to the SN1 reactivity of tertiary alkyl halides. C. Retention products could be observed in SN2 reaction. D. The nucleophilicity of a species is equal to its basicity. E. Non-polar solvent is suitable for nucleophilic substitution.
What is the first step in the general mechanism for electrophilic aromatic substitution? a. aromatic ring protonation b.loss of the electrophilic aromatic ring c. deprotonation of the aromatic ring d.addition of the electrophilic to the aromatic ring.
2) Which of the following would be the worst option for completely reducing the carbonyl in the molecule shown? a. A Wolff Kishner Reduction b. A Clemmensen Reduction c. A Raney-Nickel Reduction d. All three reactions would work equally poorly e. None of the reactions would work poorly
j. Propose a mechanism for the nitration of benzene using sulfuric acid and nitric acid mixture k. Propose a mechanism for the chlorination of benzene using molecular chlorine and acetic acid instead of ferric chloride. I. Propose a mechanism for the Friedel-Crafts acylation of benzene using acetyl chloride and aluminum chloride
Which of the following is a correct statement regarding electrophilic aromatic substitution? A. Many suitable electrophiles are unreactive and can be stored for long periods of time prior to use. B. The carbocation intermediate will lose a proton to regain aromaticity, usually from a position other than the site of the electrophilic attack. C. Formation of the carbocation intermediate has a high activation barrier due to loss of aromaticity. D. Reformation of the aromatic ring has a low activation barrier and therefore occurs slowly. E. The carbocation intermediate has several resonance structures and is negatively charged.
The rate of the reaction of methyl iodide with quinuclidine was measured in nitrobenzene, and then the rate of the reaction of methyl iodide withtriethylamine was measured in the same solvent. The concentration of the reagents was the same in both experiments.a. Which reaction had the larger rate constant?b. The same experiment was done using isopropyl iodide instead of methyl iodide. Which reaction had the larger rate constant? c. Which alkyl halide has the larger kquinuclidine/ktriethylamine ratio?
The rate of the reaction of methyl iodide with quinuclidine was measured in nitrobenzene, and then the rate of the reaction of methyl iodide with triethylamine was measured in the same solvent. The concentration of the reagents was the same in both experiments. a. Which reaction had the larger rate constant? b. The same experiment was done using isopropyl iodide instead of methyl iodide. Which reaction had the larger rate constant? c. Which alkyl halide has the larger kquinuclidine/ktriethylamine ratio
1) Which of the following could NOT be used as a precursor to form a Grignard reagent? a. b. d. e. Br Br Br Br Br
Which of the following does not support a nucleophilic attack of a covalent catalysis? a. Hydroxyl b. Sulfhydryl c. Imidazole d. Amino e. Methyl