Assertion :Addition of $B r_{2}$ in $C C I_{4}$ to trans- $2$ -butene gives a mesa form of $2, 3$ -dibromo butane. Reason: The cyclic harmonium ion formed has a plane of symmetry.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Assertion
Addition of $B r_{2}$ in $C C l_{4}$ to trans-2-butene gives a mesa form of2,3-dibromo butane.(False)

Because A meso compound is a molecule with multiple stereocenters that is superimposable on its mirror image. but trans form in above shown intermediate does not have a plane of symmetry so this is not true.
Reason

The cyclic harmonium ion formed has a plane of symmetry. (False)

So both Assertion and Reason are incorrect

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Assertion :Addition of Br2 in CCI4 to trans-2-butene gives a mesa form of 2,3-dibromo butane. Reason: The cyclic harmonium ion formed has a plane of symmetry.

Assertion :Addition of $B r_{2}$ in $C C I_{4}$ to trans- $2$ -butene gives a mesa form of $2, 3$ -dibromo butane. Reason: The cyclic harmonium ion formed has a plane of symmetry.