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Alcohols, Phenols and Ethers

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Nomenclature and methods of preparation

Subtopic

Nomenclature and methods of preparation under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    Methylated spirit is ethanol mixed with a small amount of which poisonous substance?

    A.

    Propanol

    B.

    Methanol

    C.

    Butanol

    D.

    Glycerol

  2. 2.

    Intermolecular dehydration of alcohols to form ethers is also known as:

    A.

    Continuous etherification process

    B.

    Dow's process

    C.

    Williamson synthesis

    D.

    Kolbe's process

  3. 3.

    The common name Catechol is used for which of the following dihydroxybenzenes?

    A.

    Benzene-1,2-diol

    B.

    Benzene-1,3-diol

    C.

    Benzene-1,4-diol

    D.

    Benzene-1,2,3-triol

Download the worksheet for Alcohols, Phenols and Ethers - Nomenclature and methods of preparation to practice offline. It includes additional chapter-level practice questions.

Physical and chemical properties

Subtopic

Physical and chemical properties under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    In the dehydration of alcohols to alkenes, what is the role of concentrated sulfuric acid?

    A.

    Oxidizing agent

    B.

    Reducing agent

    C.

    Protonating agent and dehydrating agent

    D.

    Catalyst only

  2. 2.

    The reaction R−OH+HX→R−X+H2OR-OH + HX \rightarrow R-X + H_2O is an example of:

    A.

    Nucleophilic substitution

    B.

    Electrophilic substitution

    C.

    Addition reaction

    D.

    Elimination reaction

  3. 3.

    What is the correct order of reactivity of hydrogen halides towards alcohols?

    A.

    HCl>HBr>HIHCl > HBr > HI

    B.

    HI>HBr>HClHI > HBr > HCl

    C.

    HBr>HCl>HIHBr > HCl > HI

    D.

    HI>HCl>HBrHI > HCl > HBr

Download the worksheet for Alcohols, Phenols and Ethers - Physical and chemical properties to practice offline. It includes additional chapter-level practice questions.

Primary, secondary and tertiary alcohols

Subtopic

Primary, secondary and tertiary alcohols under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    Which of the following describes the behavior of a primary alcohol in the Lucas test at room temperature?

    A.

    Cloudiness appears immediately

    B.

    Cloudiness appears after 5 minutes

    C.

    No cloudiness appears

    D.

    The solution turns blue

  2. 2.

    Neopentyl alcohol (2,22,2-dimethylpropan-1-ol) is classified as a:

    A.

    Primary alcohol

    B.

    Secondary alcohol

    C.

    Tertiary alcohol

    D.

    Dihydric alcohol

  3. 3.

    Comparing the C−OC-O bond length in alcohols and phenols, which of the following is true?

    A.

    It is longer in alcohols

    B.

    It is longer in phenols

    C.

    They are exactly the same

    D.

    Alcohols do not have a C−OC-O bond

Download the worksheet for Alcohols, Phenols and Ethers - Primary, secondary and tertiary alcohols to practice offline. It includes additional chapter-level practice questions.

Mechanism of dehydration

Subtopic

Mechanism of dehydration under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    In the context of alcohol dehydration, Saytzeff's rule predicts the formation of the:

    A.

    Less substituted alkene

    B.

    More substituted alkene

    C.

    The longest chain alkane

    D.

    The primary alcohol

  2. 2.

    When comparing primary, secondary, and tertiary alcohols, the temperature required for dehydration to alkenes generally:

    A.

    Increases from primary to tertiary

    B.

    Decreases from primary to tertiary

    C.

    Remains constant

    D.

    Depends only on the pressure

  3. 3.

    Which statement correctly describes the formation of an oxonium ion?

    A.

    An alcohol loses an electron

    B.

    An alcohol accepts a proton on the oxygen atom

    C.

    A carbocation reacts with water

    D.

    An alkene reacts with acid

Download the worksheet for Alcohols, Phenols and Ethers - Mechanism of dehydration to practice offline. It includes additional chapter-level practice questions.

Acidic nature of phenol

Subtopic

Acidic nature of phenol under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    Which of the following accurately describes phenol?

    A.

    Strong mineral acid

    B.

    Weak organic acid

    C.

    Strong organic base

    D.

    Weak organic base

  2. 2.

    Which of the following substituted phenols is the least acidic?

    A.

    o-Nitrophenol

    B.

    p-Nitrophenol

    C.

    m-Nitrophenol

    D.

    o-Cresol

  3. 3.

    Which of the following is true for the phenoxide ion's resonance hybrid?

    A.

    Positive charge is on the ring

    B.

    Negative charge is only on the oxygen

    C.

    Negative charge is spread over oxygen and the ring

    D.

    The ring becomes non-planar

Download the worksheet for Alcohols, Phenols and Ethers - Acidic nature of phenol to practice offline. It includes additional chapter-level practice questions.

Electrophilic substitution in phenols

Subtopic

Electrophilic substitution in phenols under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    The yield of salicylic acid in Kolbe's reaction is maximized by using:

    A.

    Sodium phenoxide

    B.

    Pure phenol

    C.

    Phenyl acetate

    D.

    Chlorobenzene

  2. 2.

    Phenol reacts with benzene diazonium chloride. What are the reaction conditions for this coupling?

    A.

    Acidic medium, high temperature

    B.

    Basic medium, low temperature (0−5∘C0-5^\circ C)

    C.

    Neutral medium, boiling temperature

    D.

    Anhydrous AlCl3AlCl_3, room temperature

  3. 3.

    Which of the following describes the nature of the −OH-OH group in electrophilic aromatic substitution?

    A.

    Meta-directing and deactivating

    B.

    Ortho-para directing and activating

    C.

    Ortho-para directing and deactivating

    D.

    Meta-directing and activating

Download the worksheet for Alcohols, Phenols and Ethers - Electrophilic substitution in phenols to practice offline. It includes additional chapter-level practice questions.

Preparation and properties of ethers

Subtopic

Preparation and properties of ethers under Alcohols, Phenols and Ethers for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    Ethers are generally resistant to the action of:

    A.

    Dilute mineral acids

    B.

    Bases and reducing agents

    C.

    Hot concentrated HIHI

    D.

    Atmospheric oxygen over time

  2. 2.

    When diethyl ether is heated with dilute H2SO4H_{2}SO_{4} under pressure, the product is:

    A.

    Ethanol

    B.

    Ethene

    C.

    Ethane

    D.

    Ethanoic acid

  3. 3.

    Friedel-Crafts acylation of anisole using CH3COClCH_{3}COCl and anhydrous AlCl3AlCl_{3} yields which major product?

    A.

    2-Methoxyacetophenone

    B.

    4-Methoxyacetophenone

    C.

    Acetophenone

    D.

    Methyl benzoate

Download the worksheet for Alcohols, Phenols and Ethers - Preparation and properties of ethers to practice offline. It includes additional chapter-level practice questions.

Alcohols, Phenols and Ethers - Class 12 Chemistry (ICSE) | Krit.club