Reaction of one molecule of H\! Br with one molecule of 1,3-butadiene at 40°C gives predominantly

  • Option 1)

    3-bromobutene under kinetically controlled conditions

  • Option 2)

    1-bromo -2-butene  under thermodynamically controlled conditions

  • Option 3)

    3- bromobutene under thermodynamically controlled conditions

  • Option 4)

    1-bromo -2-butene under kinetically controlled conditions

 

Answers (1)

As we learnt in 

Addition of Hydrogen Halide on alkene -

hydrogen halides add up to alkenes to form alkyl halides. The order of reactivity of the hydrogen halides is HI>HBr>HCl

- wherein

 

 

 


Option 1)

3-bromobutene under kinetically controlled conditions

This option is incorrect.

Option 2)

1-bromo­ -2-butene  under thermodynamically controlled conditions

This option is correct.

Option 3)

3- bromobutene under thermodynamically controlled conditions

This option is incorrect.

Option 4)

1-bromo­ -2-butene under kinetically controlled conditions

This option is incorrect.

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