The addition of bromine to trans-but- $2$ -ene gives :

meso-

2, 3

-dibromobutane

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(+) - 2, 3

-dibromobutane

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(-) - 2, 3

-dibromobutane

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None of the above

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Solution

The correct option is A meso- $2, 3$ -dibromobutane
The addition of bromine to trans-but- $2$ -ene gives Meso- $2, 3$ -dibromobutane.

The reaction proceeds through cyclic bromonium ion as intermediate.

Hence the correct option is A.

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Assertion : Addition of bromine to trans-2-butene yields meso-2, 3-dibromobutane

Reason : Bromine addition to an alkene is an electrophilic addition.

When (±)-2,3-dibromobutane reacts with $K O H$ , trans-2-bromobut-2-ene is formed. Which of the following is/are true?

During debromination of meso-2,3-dibromobutane,the major compound formed is

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