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NEET-UG and JEE Main Chemistry · Class 11

Markovnikov's rule and the peroxide effect — NEET & JEE Questions

Markovnikov's rule and the peroxide effect is a topic in Hydrocarbons, a Class 11 Chemistry chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 12 published NEET-UG and JEE Main questions on Markovnikov's rule and the peroxide effect, each with the marking scheme of the real paper.

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Markovnikov's rule and the peroxide effect MCQs with solutions

10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.

  1. Question 1 · difficulty L1 · recall

    According to Markownikoff's rule for addition of HX to an unsymmetrical alkene, hydrogen generally adds to the carbon already bearing

    • A. more hydrogen atoms
    • B. fewer hydrogen atoms
    • C. more halogen atoms
    • D. no carbon atoms

  2. Question 2 · difficulty L2 · understanding

    The peroxide effect is classically observed in the addition of

    • A. HBr
    • B. HCl
    • C. HI
    • D. HF

  3. Question 3 · difficulty L2 · understanding

    In the presence of peroxides, addition of HBr to an unsymmetrical alkene generally follows

    • A. anti-Markovnikov orientation
    • B. Markovnikov orientation only
    • C. no reaction
    • D. elimination

  4. Question 4 · difficulty L2 · understanding

    The peroxide effect occurs through a

    • A. free-radical chain mechanism
    • B. carbocation-only mechanism
    • C. nucleophilic substitution mechanism
    • D. concerted cycloaddition

  5. Question 5 · difficulty L3 · application

    What is the major product of propene + HBr in the absence of peroxide?

    • A. 2-Bromopropane
    • B. 1-Bromopropane
    • C. 1,2-Dibromopropane
    • D. Propan-1-ol

  6. Question 6 · difficulty L3 · application

    What is the major product of propene + HBr in the presence of peroxide?

    • A. 1-Bromopropane
    • B. 2-Bromopropane
    • C. 1,2-Dibromopropane
    • D. Propanone

  7. Question 7 · difficulty L3 · application

    What major product is expected when propene reacts with HCl under ordinary conditions?

    • A. 2-Chloropropane
    • B. 1-Chloropropane due to peroxide effect
    • C. Propane
    • D. Propan-2-ol

  8. Question 8 · difficulty L3 · application

    2-Methylpropene reacts with HBr without peroxide. Which carbon receives Br in the major product?

    • A. The more substituted double-bond carbon
    • B. The less substituted terminal carbon only
    • C. Neither carbon
    • D. Both carbons equally in one molecule

  9. Question 9 · difficulty L4 · application

    Which pair of products is correct for propene + HBr: first without peroxide, then with peroxide?

    • A. 2-Bromopropane; 1-bromopropane
    • B. 1-Bromopropane; 2-bromopropane
    • C. 2-Bromopropane; 2-bromopropane
    • D. 1-Bromopropane; 1-bromopropane

  10. Question 10 · difficulty L4 · application

    Why does HBr show the peroxide effect whereas HCl generally does not?

    • A. The radical-chain energetics are favourable for HBr but not for HCl
    • B. HCl cannot form any bonds to carbon
    • C. Peroxides react only with bromine atoms because of colour
    • D. HCl is not a hydrogen halide

Common mistakes in Markovnikov's rule and the peroxide effect

Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.

  • Generalises anti-Markovnikov radical addition to all HX.
  • Remembers the two products but assigns the mechanisms to the wrong conditions.

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