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Alkyl Halides MCQs for MDCAT Practice

Chemistry section, Alkyl Halides chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 696 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    Which reagent is involved in preparing 2-methylpropanenitrile from 2-iodopropane?
    • NH3
    • KCN (correct answer)
    • CH3CH2NH2
    • (CH3CH2)3N
    Correct answer: B
    This question tests the nucleophilic substitution reaction of alkyl halides with cyanide ions to form nitriles.
  2. Question 2
    Which of the following compounds could be prepared by reacting bromoethane with potassium cyanide and then reducing the product?
    • CH3CH3
    • CH3CH2NH2
    • CH3CH2CH3
    • CH3CH2CH2NH2 (correct answer)
    Correct answer: D
    This question tests nucleophilic substitution and reduction reactions of alkyl halides, specifically the conversion of bromoethane to a primary amine via a nitrile intermediate.
  3. Question 3
    In alkyl hydrolysis of a territary halide by aqueous alkail if concentration of alkail is doubled then the reaction rate
    • The reaction rate will be doubled.
    • The reaction rate will be halved.
    • The reaction rate will remain constant. (correct answer)
    • The effect on the reaction rate cannot be determined.
    Correct answer: C
    Tertiary alkyl halide hydrolysis by aqueous alkali follows an SN1 mechanism, making the reaction rate independent of alkali concentration.
  4. Question 4
    In which of the following reactions is the inorganic reagent acting as a nucleophile?
    • C6H6 + HNO3 → C6H5NO2 + H2O
    • CH3CH = CH2 + Br2 → CH3CHBrCH2Br
    • CH3CH2NH2 + HCl → CH3CH2NH3Cl
    • CH3CH2Br + NaOH → CH3CH2OH + NaBr (correct answer)
    Correct answer: D
    Identify the inorganic reagent acting as a nucleophile in various reactions, a key skill for understanding reaction mechanisms in organic chemistry.
  5. Question 5
    The common name of 2-Methyl-2-chloropropane is:
    • A) Isobutyl chloride
    • C) sec-Butyl chloride
    • D) n-Butyl chloride
    • B) tert-Butyl chloride (correct answer)
    Correct answer: D
    Master common and IUPAC nomenclature for alkyl halides to accurately name compounds like 2-Methyl-2-chloropropane as tert-Butyl chloride.
  6. Question 6
    Given are the different types of alkyl halides based on ‘R’ groups.I. RCH2−XII. R2CH−XIII. R3C−XIV. CH3−XThe increasing order of reactivity of these alkyl halides for the SN2 reaction mechanism is
    • I → II → III → IV
    • III → II → I → IV (correct answer)
    • IV → III → II → I
    • IV → I → II → III
    Correct answer: B
    SN2 reaction rate is primarily determined by steric hindrance around the electrophilic carbon; less hindered halides react faster.
  7. Question 7
    When n-butyl magnesium iodide is treated with water, the product is:
    • n-butane (correct answer)
    • Propane
    • Iso-butane
    • Alcohol
    Correct answer: A
    Grignard reagents, like n-butyl magnesium iodide, react with protic solvents such as water to form alkanes by proton abstraction.
  8. Question 8
    When 2 - bromopropane is heated with concentrated alcoholic potassium hydroxide, the major product is:
    • Propene (correct answer)
    • Propan-1-ol
    • Propan-2-ol
    • Potassium Propoxide
    Correct answer: A
    Concentrated alcoholic KOH acts as a strong base, promoting E2 elimination of alkyl halides to form alkenes, not SN2 substitution.

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