Textbook Question
Predict the products of the following reactions.
(c) 1-methylcyclohexanol + H2SO4, heat
(d) product of (c) + H2, Pt
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Ch.11 - Reactions of Alcohols
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 11, Problem 14d,e
Show how you would use a simple chemical test to distinguish between the following pairs of compounds. Tell what you would observe with each compound.
(d) allyl alcohol and propan-1-ol
(e) butan-2-one and tert-butyl alcohol
Verified step by step guidance1
Step 1: Understand the functional groups in each compound. Allyl alcohol (CH2=CH-CH2OH) contains a hydroxyl group (-OH) attached to an allylic carbon (a carbon adjacent to a double bond). Propan-1-ol (CH3-CH2-CH2OH) is a primary alcohol with no double bonds. Butan-2-one (CH3-CO-CH2-CH3) is a ketone, while tert-butyl alcohol (C(CH3)3OH) is a tertiary alcohol.
Step 2: For part (d), use the bromine water test. Bromine water (Br2 in water) reacts with compounds containing carbon-carbon double bonds. Allyl alcohol will decolorize bromine water due to the presence of the double bond, while propan-1-ol will not react and the bromine water will remain orange.
Step 3: Observe the results for part (d). Allyl alcohol will cause the orange bromine water to turn colorless, indicating the presence of a double bond. Propan-1-ol will not cause any color change, confirming the absence of a double bond.
Step 4: For part (e), use the iodoform test. The iodoform test detects methyl ketones (compounds with a CH3-CO- group) or secondary alcohols that can be oxidized to methyl ketones. Butan-2-one, being a methyl ketone, will give a positive iodoform test, forming a yellow precipitate of iodoform (CHI3). Tert-butyl alcohol, being a tertiary alcohol, will not react and will give a negative result.
Step 5: Observe the results for part (e). Butan-2-one will produce a yellow precipitate, indicating a positive iodoform test. Tert-butyl alcohol will not produce any precipitate, confirming a negative iodoform test.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alcohol Functional Groups
Alcohols are organic compounds characterized by the presence of one or more hydroxyl (-OH) groups. The position of the hydroxyl group can significantly influence the chemical properties and reactivity of the alcohol. For example, allyl alcohol has a double bond adjacent to the hydroxyl group, which can participate in different reactions compared to propan-1-ol, a primary alcohol.
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Identifying Functional Groups
Oxidation Reactions
Oxidation reactions involve the loss of electrons or an increase in oxidation state, often resulting in the conversion of alcohols to aldehydes, ketones, or carboxylic acids. In distinguishing between butan-2-one and tert-butyl alcohol, the ability of the alcohol to be oxidized is crucial. Tert-butyl alcohol, being a tertiary alcohol, is resistant to oxidation, while butan-2-one, a ketone, does not undergo oxidation in the same manner.
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Chemical Tests for Functional Groups
Specific chemical tests can be employed to identify functional groups in organic compounds. For instance, the Lucas test can differentiate between primary, secondary, and tertiary alcohols based on their reactivity with hydrochloric acid and zinc chloride. Observations such as the formation of an emulsion or a color change can indicate the presence of certain functional groups, aiding in the distinction between compounds like allyl alcohol and propan-1-ol.
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Related Practice
Textbook Question
Propose a mechanism for the reaction of
(a) 1-methylcyclohexanol with HBr to form 1-bromo-1-methylcyclohexane.
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Textbook Question
When cis-2-methylcyclohexanol reacts with the Lucas reagent, the major product is 1-chloro-1-methylcyclohexane. Propose a mechanism to explain the formation of this product.
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Textbook Question
Explain the products observed in the following reaction of an alcohol with the Lucas reagent.
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Textbook Question
Neopentyl alcohol, (CH3)3CCH2OH, reacts with concentrated HBr to give 2-bromo-2-methylbutane, a rearranged product. Propose a mechanism for the formation of this product.
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Textbook Question
The reaction of tert-butyl alcohol with concentrated HCl goes by the SN1 mechanism. Write a mechanism for this reaction.
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