MCQEasyJEE 2024Alkenes (Electrophilic Addition, Polymerisation)

JEE Chemistry 2024 Question with Solution

Which of the following reaction is correct?

  • A

    Incorrect reaction

  • B

    Correct reaction

  • C

    Partially correct reaction

  • D

    Not a valid reaction

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: We need to identify which reaction is correct.

Find: The correct option.

The solution states that each reaction should be checked for correct conservation of mass and charge, proper balanced nature, and whether the transformation is chemically feasible from the given starting materials and conditions.

  1. Examine each reaction using reaction-mechanism logic.
  2. Verify that the number of each type of atom is the same on both sides.
  3. Check whether the reaction matches known chemistry principles.

The solution explicitly concludes that Reaction 2 is correct and states that the correct option is B.

Therefore, the correct option is B.

Detailed Note from the solution

Reaction diagram showing a methyl-substituted cyclohexene reacting with HI to form an iodine-substituted methylcyclohexane product, labeled as Markovnikov addition.

The additional solution note says that the correct reaction is the one shown in Fig 2. It describes addition of HI to the alkene and identifies it as Markovnikov addition, with iodine added to the more substituted carbon.

Therefore, this supports option B as the correct choice.

Common mistakes

  • Checking only whether a reaction 'looks familiar' is incorrect, because a valid reaction must also satisfy conservation of atoms and charge. Always verify balancing and feasibility together.

  • Assuming any product formed with a common reagent is correct is wrong, because regiochemistry and mechanism matter. Check whether the product follows the expected reaction rule, such as Markovnikov addition when applicable.

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