Preethi posted an Question
July 29, 2021 • 20:20 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Addition of bromine to acetylenes give only trans-dibromides. however phenylacetylene gives both cis- and trans-dibromides. explain this observation c h +br br

Addition of bromine to acetylenes give only trans-dibromides. However phenylacetylene gives both cis- and trans-dibromides. Explain this observation C H +Br Br H AcOH Phenylacetylene Br CIS (3190 trans (699

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  • Pinky chaudhary

    the carbocation formed in acetylene on the addition of first bromine is not stable so here the mechanism fallowed is SN2 While in phenylacetylene the carbocation formed is stable through resonance so here the SN1 Mechanism will be followed. hence it gives cis and trans both as product

  • Pinky chaudhary

    the carbocation formed in acetylene on the addition of first bromine is not stable so here the mechanism fallowed is SN2 While in phenylacetylene the carbocation formed is stable through resonance so here the SN1 Mechanism will be followed. hence it gives cis and trans both as product

  • Pinky chaudhary

    the carbocation formed in acetylene on the addition of first bromine is not stable so here the mechanism fallowed is SN2 While in phenylacetylene the carbocation formed is stable through resonance so here the SN1 Mechanism will be followed. hence it gives cis and trans both as product

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