RE-NEET 2026 Chemistry Alkenes Assertion Reason Question
Given below are two statements:
Statement I: trans-But-2-ene upon treatment with Br₂ in CCl₄ gives the following product.
Statement II: cis-But-2-ene upon treatment with alkaline KMnO₄ gives the following product.
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
Correct Answer
Detailed Explanation
Statement I is incorrect because trans-But-2-ene reacts with Br₂ in CCl₄ to form a dibromide, specifically 2,3-dibromobutane, which is not the product shown. Statement II is correct; cis-But-2-ene reacts with alkaline KMnO₄ to undergo syn-dihydroxylation, yielding a diol, which matches the product depicted.
The tempting wrong options fail because they either incorrectly assert both statements are correct or misinterpret the reactions involved. Thus, the correct answer is C: Statement I is incorrect but Statement II is correct.
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