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Haloalkanes and Haloarenes

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

Nomenclature and nature of C-X bond

Subtopic

Nomenclature and nature of C-X bond under Haloalkanes and Haloarenes for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following is the correct classification for CH3CHClCH3CH_{3}CHClCH_{3}?

    A.

    Primary haloalkane

    B.

    Secondary haloalkane

    C.

    Tertiary haloalkane

    D.

    Aryl halide

  2. 2.

    Which of the following molecules contains a vinylic halide group?

    A.

    CH3CH2ClCH_{3}CH_{2}Cl

    B.

    CH2=CH−CH2ClCH_{2}=CH-CH_{2}Cl

    C.

    CH2=CHClCH_{2}=CHCl

    D.

    C6H5ClC_{6}H_{5}Cl

  3. 3.

    In the C−XC-X bond of a haloalkane (XX = Halogen), which atom carries a partial positive charge (δ+\delta +)?

    A.

    The halogen atom

    B.

    The carbon atom

    C.

    Both atoms equally

    D.

    Neither atom

Download the worksheet for Haloalkanes and Haloarenes - Nomenclature and nature of C-X bond to practice offline. It includes additional chapter-level practice questions.

Methods of preparation

Subtopic

Methods of preparation under Haloalkanes and Haloarenes for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In the electrophilic substitution of benzene with chlorine to form chlorobenzene, what is the specific role of anhydrous FeCl3FeCl_{3}?

    A.

    To absorb the HClHCl formed

    B.

    To act as a reducing agent

    C.

    To generate the Cl+Cl^{+} electrophile

    D.

    To prevent the further chlorination of benzene

  2. 2.

    Observe the reaction flowchart below. What is the IUPAC name of the major product 'X' formed according to Markovnikov's rule?

    A.

    1-bromopropane

    B.

    2-bromopropane

    C.

    1,2-dibromopropane

    D.

    Cyclopropane

  3. 3.

    The Finkelstein reaction is used to prepare alkyl iodides by treating alkyl chlorides or bromides with which of the following reagents?

    A.

    AgIAgI in water

    B.

    NaINaI in dry acetone

    C.

    I2I_{2} in CCl4CCl_{4}

    D.

    HIHI in the presence of H2SO4H_{2}SO_{4}

Download the worksheet for Haloalkanes and Haloarenes - Methods of preparation to practice offline. It includes additional chapter-level practice questions.

Physical and chemical properties

Subtopic

Physical and chemical properties under Haloalkanes and Haloarenes for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    Which reaction is used to prepare higher alkanes from alkyl halides using metallic sodium in dry ether?

    A.

    Wurtz reaction

    B.

    Finkelstein reaction

    C.

    Swarts reaction

    D.

    Friedel-Crafts reaction

  2. 2.

    What is the correct order of C−XC-X bond strength in haloalkanes?

    A.

    CH3−F>CH3−Cl>CH3−Br>CH3−ICH_3-F > CH_3-Cl > CH_3-Br > CH_3-I

    B.

    CH3−I>CH3−Br>CH3−Cl>CH3−FCH_3-I > CH_3-Br > CH_3-Cl > CH_3-F

    C.

    CH3−Cl>CH3−F>CH3−Br>CH3−ICH_3-Cl > CH_3-F > CH_3-Br > CH_3-I

    D.

    CH3−F>CH3−I>CH3−Cl>CH3−BrCH_3-F > CH_3-I > CH_3-Cl > CH_3-Br

  3. 3.

    The reaction of ethyl bromide with aqueous KOHKOH primarily yields:

    A.

    Ethene

    B.

    Ethanol

    C.

    Ethane

    D.

    Ethyl methyl ether

Download the worksheet for Haloalkanes and Haloarenes - Physical and chemical properties to practice offline. It includes additional chapter-level practice questions.

Mechanism of substitution reactions (SN1 and SN2)

Subtopic

Mechanism of substitution reactions (SN1 and SN2) under Haloalkanes and Haloarenes for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    Among the following compounds, which one is most likely to react fastest in an SN2S_N2 reaction with aqueous KOHKOH?

    A.

    (CH3)3CCl(CH_3)_3CCl

    B.

    CH3ClCH_3Cl

    C.

    (CH3)2CHCl(CH_3)_2CHCl

    D.

    CH3CH2CH2ClCH_3CH_2CH_2Cl

  2. 2.

    The complete inversion of configuration during a nucleophilic substitution reaction is popularly known as:

    A.

    Walden Inversion

    B.

    Racemization

    C.

    Markovnikov Addition

    D.

    Saytzeff Rule

  3. 3.

    Arrange the following alkyl halides in the increasing order of their reactivity towards the SN1S_N1 mechanism: CH3X,(CH3)2CHX,(CH3)3CX,CH3CH2XCH_3X, (CH_3)_2CHX, (CH_3)_3CX, CH_3CH_2X.

    A.

    (CH3)3CX<(CH3)2CHX<CH3CH2X<CH3X(CH_3)_3CX < (CH_3)_2CHX < CH_3CH_2X < CH_3X

    B.

    CH3CH2X<CH3X<(CH3)2CHX<(CH3)3CXCH_3CH_2X < CH_3X < (CH_3)_2CHX < (CH_3)_3CX

    C.

    CH3X<CH3CH2X<(CH3)2CHX<(CH3)3CXCH_3X < CH_3CH_2X < (CH_3)_2CHX < (CH_3)_3CX

    D.

    (CH3)2CHX<CH3CH2X<CH3X<(CH3)3CX(CH_3)_2CHX < CH_3CH_2X < CH_3X < (CH_3)_3CX

Download the worksheet for Haloalkanes and Haloarenes - Mechanism of substitution reactions (SN1 and SN2) to practice offline. It includes additional chapter-level practice questions.

Optical rotation

Subtopic

Optical rotation under Haloalkanes and Haloarenes for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the relationship between two stereoisomers that are non-superimposable mirror images of each other?

    A.

    Diastereomers

    B.

    Enantiomers

    C.

    Structural isomers

    D.

    Geometric isomers

  2. 2.

    A substance that rotates the plane of polarized light towards the right (clockwise) is termed as:

    A.

    Dextrorotatory

    B.

    Laevorotatory

    C.

    Meso compound

    D.

    Racemic mixture

  3. 3.

    Which of the following instruments is used to measure the optical rotation of a chemical compound?

    A.

    Spectrophotometer

    B.

    Polarimeter

    C.

    Refractometer

    D.

    Viscometer

Download the worksheet for Haloalkanes and Haloarenes - Optical rotation to practice offline. It includes additional chapter-level practice questions.

Reactions of haloarenes

Subtopic

Reactions of haloarenes under Haloalkanes and Haloarenes for Grade 12 ICSE.

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Preview questions (no answers)

  1. 1.

    What are the reagents used for the nitration of chlorobenzene?

    A.

    Conc. HClHCl and Conc. H2SO4H_2SO_4

    B.

    Conc. HNO3HNO_3 and Conc. H2SO4H_2SO_4

    C.

    Dilute HNO3HNO_3

    D.

    NaNO2_2 and HClHCl

  2. 2.

    Haloarenes are significantly less reactive than haloalkanes towards nucleophilic substitution reactions. Which of the following is a primary reason for this?

    A.

    Inductive effect of the benzene ring

    B.

    Resonance effect leading to partial double bond character in C-X bond

    C.

    Larger size of the halogen atom

    D.

    Presence of alpha-hydrogen atoms

  3. 3.

    In the electrophilic chlorination of chlorobenzene using Cl2Cl_2 and FeCl3FeCl_3, what is the major product formed?

    A.

    p-dichlorobenzene

    B.

    o-dichlorobenzene

    C.

    m-dichlorobenzene

    D.

    1,3,5-trichlorobenzene

Download the worksheet for Haloalkanes and Haloarenes - Reactions of haloarenes to practice offline. It includes additional chapter-level practice questions.

Polyhalogen compounds

Subtopic

Polyhalogen compounds under Haloalkanes and Haloarenes for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    When Chloroform is exposed to light and air, it slowly oxidizes into a highly poisonous gas known as phosgene. What is the chemical formula of phosgene?

    A.

    PCl3PCl_{3}

    B.

    COCl2COCl_{2}

    C.

    CCl4CCl_{4}

    D.

    CH3ClCH_{3}Cl

  2. 2.

    Which polyhalogen compound is widely used as a solvent, a paint remover, and a propellant in aerosols?

    A.

    Dichloromethane (CH2Cl2CH_{2}Cl_{2})

    B.

    Iodoform (CHI3CHI_{3})

    C.

    DDT

    D.

    Chlorobenzene

  3. 3.

    What is the common name for the polyhalogen compound Trichloromethane?

    A.

    Carbon tetrachloride

    B.

    Bromoform

    C.

    Chloroform

    D.

    Freon

Download the worksheet for Haloalkanes and Haloarenes - Polyhalogen compounds to practice offline. It includes additional chapter-level practice questions.

Haloalkanes and Haloarenes - Class 12 Chemistry (ICSE) | Krit.club