Haloalkanes and Haloarenes Quiz
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Questions and Answers

Which of the following is NOT an example of an aryl halide?

  • (2) (correct)
  • (1)
  • (4)
  • (3)

    • Which statement about the given representations of haloalkanes and haloarenes is true?

  • (1) represents a vinylic halide.
  • (2) represents an allylic halide.
  • (3) represents a benzylic halide. (correct)
  • All of the above.

    • Which of the following represents 4-Bromo-3-methylpent-2-ene?

  • (3) (correct)
  • (4)
  • (2)
  • (1)

    • Which of the options contains ONLY secondary (2°) halides?

    <p>a, c, and d</p> Signup and view all the answers

    Identify the compound from the options that is classified as a benzylic halide.

    <p>(1)</p> Signup and view all the answers

    Which of the given structures represents a vinyl halide?

    <p>(2)</p> Signup and view all the answers

    Which of the listed methods is NOT a suitable method for obtaining a halide?

    <p>(3)</p> Signup and view all the answers

    Why is sulfuric acid not used during the reaction of alcohol with KI?

    <p>I⁻ is a strong reducing agent, reducing H₂SO₄ to I₂.</p> Signup and view all the answers

    Which of the following alkyl halides is the most reactive towards an SN2 reaction?

    <p>1</p> Signup and view all the answers

    In the reaction Ph-CH(Cl)-Ph + H2O → Ph-CH(OH)-Ph, which statement is incorrect?

    <p>The reaction is a bimolecular substitution.</p> Signup and view all the answers

    Which of these reactions demonstrates pure inversion of configuration?

    <p>Reaction 1</p> Signup and view all the answers

    Which alkyl halide, when heated with KOH, will produce only one alkene product?

    <p>2-Bromo-2-methylpropane</p> Signup and view all the answers

    Which statement correctly describes the carbon-magnesium bond in a Grignard reagent?

    <p>It is a highly polar covalent bond.</p> Signup and view all the answers

    Why are aryl halides generally less reactive than aliphatic halides towards nucleophilic substitution reactions (NSR)?

    <p>The sp2 carbon of the ring holds the electron pair of the C–X bond more tightly.</p> Signup and view all the answers

    What is the major factor that influences the reactivity of alkyl halides in an SN2 reaction?

    <p>The presence of bulky groups around the reaction center</p> Signup and view all the answers

    Which of the following is an example of a unimolecular nucleophilic substitution reaction (SN1)?

    <p>Ph—CH—Ph + H2O → Ph—CH—Ph | | Cl OH</p> Signup and view all the answers

    Which statement about the bromination of (CH3)2CH–CH2–CH3 under light is incorrect?

    <p>The reaction requires high temperatures</p> Signup and view all the answers

    Which reaction yields an aryl halide as the primary product?

    <p>Reaction of benzene with $Cl_2$ in the presence of $FeCl_3$</p> Signup and view all the answers

    Which reaction does NOT produce a cyanide as a major product?

    <p>Both (B) and (C)</p> Signup and view all the answers

    Why does the reaction of a haloalkane with AgCN primarily yield an isocyanide instead of a cyanide?

    <p>AgCN is mainly covalent, and the nitrogen atom is free to donate electron pair.</p> Signup and view all the answers

    Which of the following reactions is an example of racemization at a chiral center?

    <p>$CH_3–CH(D)–Cl + OH^- \rightarrow$</p> Signup and view all the answers

    Which statement about the reaction of haloarenes with nucleophiles is incorrect?

    <p>The effect of electron-withdrawing groups is most effective when they are at the meta position.</p> Signup and view all the answers

    What is a correct statement about the oxidation of alcohols?

    <p>Oxidation of secondary alcohols results in ketones.</p> Signup and view all the answers

    Regarding the influence of a nitro group (-NO2) on the stability of intermediate anions in nucleophilic substitution of haloarenes, which statement is correct?

    <p>The -NO2 group at the ortho and para positions provides greater stability compared to the meta position.</p> Signup and view all the answers

    What is the major product of the reaction between (CH3)2CH–CH2–CH3 and $Br_2$ in the presence of light?

    <p>$(CH_3)_2CH–CHBr–CH_3$</p> Signup and view all the answers

    What is the correct relationship between the statements regarding the effect of -NO2 group?

    <p>Both Statement I and Statement II are true.</p> Signup and view all the answers

    Which statement about the reaction between $Ph–CH_2–OH$ and NaCN is correct?

    <p>No reaction will occur under normal conditions.</p> Signup and view all the answers

    In nitration of haloarenes, why is the major product a para-substituted isomer instead of a meta-substituted isomer despite chlorine being a deactivating group?

    <p>The resonance effect (+M) of chlorine directs the incoming group to the para position, overwhelming the inductive effect.</p> Signup and view all the answers

    Which statement correctly describes the influence of inductive (-I) and resonance (+M ) effects in the nitration of haloarenes?

    <p>The resonance effect (+M) of halogens dominates the inductive effect (-I), directing substitution to the ortho and para positions.</p> Signup and view all the answers

    Which statement regarding freons is false?

    <p>Freons are only stable within the troposphere.</p> Signup and view all the answers

    Which of the following would be considered as a freon?

    <p>$CCl_2F_2$</p> Signup and view all the answers

    What is the primary function of freons in a typical application?

    <p>To serve as a propellant in aerosol sprays and as a refrigerant</p> Signup and view all the answers

    What is the relationship between the presence of a -M group on a ring and the ease of nucleophilic substitution reactions (NSR)?

    <p>A -M group facilitates nucleophilic attack, making NSR easier.</p> Signup and view all the answers

    Why is it crucial to prepare Grignard reagents under anhydrous conditions?

    <p>Water reacts violently with Grignard reagents leading to their deactivation.</p> Signup and view all the answers

    What is the effect of CCl4 on the ozone layer?

    <p>It contributes to the depletion of the ozone layer.</p> Signup and view all the answers

    Which of the following statements about alkyl halides and water is true?

    <p>Alkyl halides are polar but immiscible with water.</p> Signup and view all the answers

    What is the main nucleophilic substitution product when n-Butyl bromide reacts with KCN?

    <p>n-butyl cyanide</p> Signup and view all the answers

    Which statement accurately describes the conditions for nucleophilic substitution reaction (NSR) of haloarenes and 2,4,6-trinitro haloarenes?

    <p>Haloarenes undergo NSR at high temperature, and 2,4,6-trinitro haloarenes undergo NSR at low temperature.</p> Signup and view all the answers

    How does CCl4 exposure affect the human body according to the text?

    <p>It can cause irregular or stopped heartbeats.</p> Signup and view all the answers

    Which compound from the following is more readily hydrolyzed and why: C6H5–CHCl–C6H5 or C6H5–CH2–Cl?

    <p>C6H5–CHCl–C6H5 is more readily hydrolyzed because the carbocation formed is more stable.</p> Signup and view all the answers

    Study Notes

    Haloalkanes and Haloarenes

    • Question 1: Which is not an aryl halide?

      • Option 3 is the correct answer.

    • Question 2: Which is a true statement?

      • Option 1 is correct: X is an allylic halide. Option 2 is correct: X is a vinylic halide. Option 3 is correct: X is a benzylic halide. Option 4 is implied as a correct option.

    • Question 4: Which halide is secondary? (More than one answer)

      • Option a: CH2=CH-CH-Cl is a secondary halide.
      • Option c: Ph-CH-Ph is a secondary halide.
      • Option d: A structure (drawn) is a secondary halide.
      • Option e: A structure (drawn) is a secondary halide.

    • Question 5: What is the major product of the reaction CH2=C=CH2 + HBr Peroxide?

      • Option 1 is the correct answer.

    • Question 6: What is the product of the reaction? (with appropriate structure)

      • Option 3 (with structure) is the correct answer.

    • Question 7: Which method is incorrect to obtain a halide?

      • Option 1 is not a correct method.

    • Question 8: Why is H2SO4 not used with alcohols and KI?

      • I- is a strong reducing agent, reducing H2SO4 into I2.

    • Question 9: Incorrect statement about reaction (CH3)2CHCH2CH3 + Br2 --> (with structure)?

      • Option 1 is incorrect: The major product is (CH3)2CBrCH2CH3.

    • Question 10: Which reaction gives an aryl halide as a major product?

      • Option 1: Aryl halide (with structure).

    • Question 11: Major product in reaction (with structure) is what?

      • Option 1 (with structure).

    • Question 12: Major product in reaction with structure?

      • Option 4 (with structure).

    • Question 13: Missing reaction and options.

    • Question 14: Reaction that does not give cyanide (with structures).

      • Option 3 (with structure)is incorrect.

    • Question 15: Reaction of haloalkane with AgCN gives isocyanide as major product due to...

      • AgCN is mainly covalent and carbon is free to donate electron pairs.

    • Question 16: Most reactive towards SN2?

      • Option 1 (with applicable structure).

    • Question 17: Incorrect statement in the following reaction (with structure)?

      • Option 2 (incorrect statement).

    • Question 18: Example of pure inversion?

      • Option 3 (with structure).

    • Question 19: Example of racemization reaction?

      • Option 4 (with structure).

    • Question 20: Reaction of alkene with structure (with product structures)?

      • Option 1 (with structure) is the correct answer.

    • Question 21: Which alkene can result in only one alkene when heated with KOH?

      • Option 2: 2-Bromo-2-methyl propane.

    • Question 22: Correct statement about Grignard reagents?

      • Option 2: Carbon-magnesium bond is an ionic bond.

    • Question 23: Why is aryl halide less reactive (than aliphatic) in nucleophilic substitution reactions?

      • Electron pairs on halogen conjugate with ring bonds.

    • Question 24: Incorrect statement about reaction? (with structure)

      • Option 3 is incorrect.

    • Question 25: Statement I and II regarding nucleophilic substitution in haloarenes.

      • Statement I is true, but Statement II is false.

    • Question 26: Assertion and Reason about haloarenes giving nucleophilic substitution reactions.

      • Both Assertion and Reason are true, but Reason is not a correct explanation.

    • Question 27: Assertion and Reason about chlorination of haloarenes.

      • Assertion is true but Reason is false.

    • Question 28: False statement about Freons.

      • Option 4 is false: In troposphere, freon does not initiate radical chain reactions.

    • Question 29: Statement I and II regarding ozone depletion by CCl4.

      • Statement I is false, but Statement II is true.

    • Question 30: Incorrect statement(s)?

      • Option 4 is incorrect - alkyl halides are polar and miscible with water. (emphasis on miscible)

    Answer Key (from the provided image)

    • A table of answers is provided after the questions. Directly refer to the table for specific answers to each question.

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    Haloalkanes and Haloarenes PDF

    Description

    Test your knowledge on haloalkanes and haloarenes with this quiz. Answer questions about aryl halides, allylic and vinylic halides, and secondary halides. Challenge yourself to identify reaction products and methods for obtaining halides.

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