AIIMS 2019 Chemistry Free Radical Reactions Assertion Reason Question
Assertion: Propene reacts with HI in presence of peroxide give¹⁻iodopropane. Reason: 1° free radical is less stable than 2° free radical
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is false because propene (C₃H₆) does not yield 1-iodopropane (C₃H₇I) when reacting with HI in the presence of peroxides; instead, it leads to the formation of 2-iodopropane due to the anti-Markovnikov addition mechanism facilitated by free radicals. The reason is also false because while it is true that 1° free radicals are less stable than 2° free radicals, this stability comparison does not apply to the reaction in question, which does not favor the formation of a 1° iodide. Options A, B, and C are incorrect as they all assume the assertion or reason is true, which is not the case here.
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