Exam 12: Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

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Diethyl ether,the most commonly used solvent for Grignard reactions,also acts as an 'internal cooling agent',preventing the overheating of the reaction mixture: what specific property of diethyl ether is exploited here and why is it important to prevent the overheating of the reaction mixture?

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Question 1

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Diethyl ether is very volatile (35-36^oC): its low boiling point ensures that reactions carried out in diethyl ether solvent cannot become overheated (the maximum temperature cannot exceed the b.p.of the solvent): this is important in Grignard reactions,because Grignard reagents decompose at higher temperatures.Thus,the decomposition of the newly formed Grignard reagent is minimized by use of this 'internal cooling agent'.

Primary and secondary alcohols can be distinguished from most other compounds (with the exception of aldehydes)because they will react rapidly with a solution of CrO₃ in aqueous sulfuric acid,causing a color change from __ to _.

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orange;green

What is/are the principal product(s)formed when excess methylmagnesium iodide reacts with p-hydroxyacetophenone ?

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Which of these is the least reactive type of organometallic compound?

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Question 4

Which of the following synthetic procedures would be employed most effectively to transform ethanol into ethyl propyl ether?

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Question 5

Suggest a reasonable synthetic strategy for the synthesis of 1,4-pentanediol from 4-hydroxybutanal HOCH₂CH₂CH₂CHO.

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Question 6

Predict the product(s)of the following reaction sequence:

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Question 7

Upon reaction with a primary or secondary alcohol,the change in oxidation state of chromium ion in Jones reagent is from to __.

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Question 8

Predict the product(s)of the following reaction sequence:

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Question 9

Predict the product(s)of the following reaction sequence:

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Question 10

If the role of the solvent is to assist in the preparation and stabilization of the Grignard reagent by coordination with the magnesium,which of these solvents should be least effective?

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Question 11

Which reaction leads to an optically active product?

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Question 12

The following transformation would be considered a(n)?

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Question 13

PCC and CrO₃ are both Cr(VI)reagents.However,PCC/CH₂Cl₂ is useful in oxidizing primary alcohols to aldehydes,while the analogous reaction with CrO₃/H₂SO₄ will typically produce carboxylic acids.Why?

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Question 14

What is the product,A,that would be obtained from the following reaction sequence?

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Question 15

The final product,E,in the following reaction sequence is,

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Question 16

Which of the reagents listed below would serve as the basis for a simple chemical test to distinguish between (CH₃)₃COH and (CH₃)₂CHCH₂OH ?

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Question 17

List the following compounds in order of increasing level of oxidation:

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Question 18

In which of the following series are the compounds arranged in order of decreasing basicity?

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Question 19

When 2-pentanol is treated with chromic acid,

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Question 20

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Exam 12: Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Diethyl ether,the most commonly used solvent for Grignard reactions,also acts as an 'internal cooling agent',preventing the overheating of the reaction mixture: what specific property of diethyl ether is exploited here and why is it important to prevent the overheating of the reaction mixture?

Primary and secondary alcohols can be distinguished from most other compounds (with the exception of aldehydes)because they will react rapidly with a solution of CrO3 in aqueous sulfuric acid,causing a color change from ______________ to _____________.

What is/are the principal product(s)formed when excess methylmagnesium iodide reacts with p-hydroxyacetophenone ?

Which of these is the least reactive type of organometallic compound?

Which of the following synthetic procedures would be employed most effectively to transform ethanol into ethyl propyl ether?

Suggest a reasonable synthetic strategy for the synthesis of 1,4-pentanediol from 4-hydroxybutanal HOCH2CH2CH2CHO.

Predict the product(s)of the following reaction sequence:

Upon reaction with a primary or secondary alcohol,the change in oxidation state of chromium ion in Jones reagent is from ________to __________.

Predict the product(s)of the following reaction sequence:

Predict the product(s)of the following reaction sequence:

If the role of the solvent is to assist in the preparation and stabilization of the Grignard reagent by coordination with the magnesium,which of these solvents should be least effective?

Which reaction leads to an optically active product?

The following transformation would be considered a(n)?

PCC and CrO3 are both Cr(VI)reagents.However,PCC/CH2Cl2 is useful in oxidizing primary alcohols to aldehydes,while the analogous reaction with CrO3/H2SO4 will typically produce carboxylic acids.Why?

What is the product,A,that would be obtained from the following reaction sequence?

The final product,E,in the following reaction sequence is,

Which of the reagents listed below would serve as the basis for a simple chemical test to distinguish between (CH3)3COH and (CH3)2CHCH2OH ?

List the following compounds in order of increasing level of oxidation:

In which of the following series are the compounds arranged in order of decreasing basicity?

When 2-pentanol is treated with chromic acid,

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

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Primary and secondary alcohols can be distinguished from most other compounds (with the exception of aldehydes)because they will react rapidly with a solution of CrO₃ in aqueous sulfuric acid,causing a color change from __ to _.

Suggest a reasonable synthetic strategy for the synthesis of 1,4-pentanediol from 4-hydroxybutanal HOCH₂CH₂CH₂CHO.

Upon reaction with a primary or secondary alcohol,the change in oxidation state of chromium ion in Jones reagent is from to __.

PCC and CrO₃ are both Cr(VI)reagents.However,PCC/CH₂Cl₂ is useful in oxidizing primary alcohols to aldehydes,while the analogous reaction with CrO₃/H₂SO₄ will typically produce carboxylic acids.Why?

Which of the reagents listed below would serve as the basis for a simple chemical test to distinguish between (CH₃)₃COH and (CH₃)₂CHCH₂OH ?