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    I need to explain hwy but-2-en-1-ol has a higher bp.p then 1-bromobut-2-ene

    I said they both contain van der walls, and possess dipole-dipole interaction. Cbeing delta positive and the Br delta negative. I said that but-2-en-1-ol has hydrogen bonding and the bromo compund doesnt, and that as the hydrogen bonding is a lot stronger then all the other intermolecular foces, more energy is needed to break the bonds, so therefore it has a stronger boiling point.
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    No bonds are broken when things boil, only intermolecular forces.

    So the H-bonds take more energy to break than the vdW forces.
 
 
 
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