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ISC Class 12 Haloalkanes, Alcohols and Ethers — practice questions — page 2

Explore 50 free Haloalkanes, Alcohols and Ethers questions in ISC Class 12 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Haloalkanes, Alcohols and Ethers questions and exercises with answers

Showing questions 31–50 of 50.

$\mathrm{(CH_3)_3CCl}$ is classified as aRead the answer and worked solution →Haloalkanes are compounds derived from alkanes byRead the answer and worked solution →True or false: alcohols and phenolsRead the answer and worked solution →The Williamson ether synthesis works best with:Read the answer and worked solution →Phenol reacts with bromine WATER (aqueous $\mathrm{Br_2}$) at room temperature to giveRead the answer and worked solution →Alcohol, phenol or ether?Read the answer and worked solution →Phenol is more acidic than ethanol because:Read the answer and worked solution →The IUPAC name of $\mathrm{(CH_3)_2CHOH}$ isRead the answer and worked solution →The WILLIAMSON ETHER SYNTHESIS prepares ethers by reactingRead the answer and worked solution →The acidity (Brønsted acidity) order of the following isRead the answer and worked solution →Ethanol heated with concentrated $\mathrm{H_2SO_4}$ at $443\,\text{K}$ (170°C) gives mainlyRead the answer and worked solution →An ALCOHOL in which the $\mathrm{-OH}$ group is attached to a carbon bonded to ONE other alkyl group is classified asRead the answer and worked solution →The REIMER-TIEMANN reaction converts phenol to salicylaldehyde. The reagents areRead the answer and worked solution →The reactivity of haloalkanes toward nucleophilic substitution generally follows the orderRead the answer and worked solution →The reaction of ethanol with sodium metal producesRead the answer and worked solution →The IUPAC name of $\mathrm{(CH_3)_2CH{-}CH_2Br}$ isRead the answer and worked solution →A GRIGNARD REAGENT is formed by reacting an alkyl halide withRead the answer and worked solution →NEET · Chemistry · Primary or Secondary AlcoholRead the answer and worked solution →Ethanol reacts with $\mathrm{PCl_5}$ to give which set of products?Read the answer and worked solution →The KOLBE reaction converts phenol (in the form of sodium phenoxide) into salicylic acid. The conditions and key reagent areRead the answer and worked solution →

Worked practice questions

$\mathrm{(CH_3)_3CCl}$ is classified as a

  1. primary (1°) haloalkane
  2. secondary (2°) haloalkane
  3. tertiary (3°) haloalkane
  4. vinyl halide
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Correct answer: C. tertiary (3°) haloalkane

1. Your syllabus: haloalkanes are classified by the type of carbon bearing the halogen. 2. PRIMARY: the carbon attached to halogen is connected to ONE other carbon. SECONDARY: two. TERTIARY: three. 3. In $\mathrm{(CH_3)_3CCl}$, the C bonded to Cl is connected to THREE other carbons (three methyl groups). 4. So this is a TERTIARY (3°) haloalkane. Common name: tert-butyl chloride; IUPAC: 2-chloro-2-methylpropane. 5. Tertiary haloalkanes favour SN1 mechanisms (stable tertiary carbocations). 6. Options A and B are wrong substitution counts. Option D requires C=C adjacent to the halogen, not present here. _Source: syllabus Chemistry Part 2, Ch 6, §6.1 (Classification — 1°/2°/3°), p. 1–2._

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Haloalkanes are compounds derived from alkanes by

  1. replacing one or more hydrogen atoms with halogen atoms
  2. adding $\mathrm{OH}$ groups to the chain
  3. removing the terminal carbon
  4. converting all C-H bonds to C-O bonds
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Correct answer: A. replacing one or more hydrogen atoms with halogen atoms

1. Your syllabus: a haloalkane (alkyl halide) is an alkane in which one or more H atoms have been replaced by HALOGEN atoms (F, Cl, Br, or I). 2. General formula for monohaloalkanes: $\mathrm{C_nH_{2n+1}X}$, where X is the halogen. 3. Examples: $\mathrm{CH_3Cl}$ (chloromethane), $\mathrm{CH_3CH_2Br}$ (bromoethane), $\mathrm{(CH_3)_3CCl}$ (tert-butyl chloride). 4. Distinct from haloarenes (where the halogen is attached to an aromatic ring — e.g. $\mathrm{C_6H_5Cl}$ chlorobenzene). 5. Options B (alcohols), C (chain shortening), D (over-oxidation) describe different transformations. _Source: syllabus Chemistry Part 2, Ch 6 "Haloalkanes and Haloarenes", §6.1 (Classification), p. 1._

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True or false: alcohols and phenols

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Questions
  1. Statement is true
    Yes
    Statement
    An alcohol has its OH group attached to a carbon chain.
  2. Statement is true
    Yes
    Statement
    A phenol has its OH group attached to a benzene ring.
  3. Statement is true
    Yes
    Statement
    Ethers are prepared by the Williamson synthesis.
  4. Statement is true
    No
    Statement
    Alcohols and phenols are the same class of compound.
Instructions
Decide whether each statement is true or false.
_Source: syllabus Chemistry Alcohols Phenols and Ethers, Alcohols_

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