Assertion : Cis-But-2-ene and trans-but-2-ene on reaction with $B r_{2}$ in $C C l_{4}$ gives meso-2,3-dibromobutane and (dl) 2,3-dibromobutane respectively.
Reason : Addition of $B r_{2}$ on double bond involved anti addition.

Assertion is True, Reason is True; Reason is a correct explanation for Assertion.

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Assertion is True, Reason is True; Reason is NOT a correct explanation for Assertion.

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Assertion is True, Reason is False.

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Assertion is False, Reason is True.

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Solution

The correct option is D Assertion is False, Reason is True.
Addition of $B r_{2}$ on double bond involved anti addition. So Cis-But-2-ene on reaction with $B r_{2}$ in $C C l_{4}$ give (dl) 2,3-dibromobutane respectively. Trans-but-2-ene on reaction with $B r_{2}$ in $C C l_{4}$ give meso-2,3- dibromobutane.

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Assertion : Cis-But-2-ene and trans-but-2-ene on reaction with Br2 in CCl4 gives meso-2,3-dibromobutane and (dl) 2,3-dibromobutane respectively. Reason : Addition of Br2 on double bond involved anti addition.

The correct option is D Assertion is False, Reason is True.Addition of Br2 on double bond involved anti addition. So Cis-But-2-ene on reaction with Br2 in CCl4 give (dl) 2,3-dibromobutane respectively. Trans-but-2-ene on reaction with Br2 in CCl4 give meso-2,3- dibromobutane.

Assertion : Cis-But-2-ene and trans-but-2-ene on reaction with $B r_{2}$ in $C C l_{4}$ gives meso-2,3-dibromobutane and (dl) 2,3-dibromobutane respectively.
Reason : Addition of $B r_{2}$ on double bond involved anti addition.