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I have come unstuck on why - despite the fact that hydrogen bromide is a polar molecule - why it does not react with ethene via electrophilic addition in its gaseous state? For example, bromine reacts with ethene by becoming an induced dipole and then reacting via electrophilic addition. Why does H-Br(g) not? Is is to do with boiling temperature?

See the bottom of this scanned textbook page

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  • $\begingroup$ Hi and welcome to chemistry.stackexchange.com. Feel free to take a tour of the site. Visit the help center to answer any remaining questions on how it works. Unfortunately, your question is rather unclear (and the big image isn’t helping), hence it may get closed. You can (and probably should) edit your post by clicking the grey edit-link below the tags to include additional context and maybe better descriptive images. $\endgroup$ – Jan Nov 29 '15 at 13:38
  • $\begingroup$ Did you actually read the textbook?? I quote ethene reacts readily at room temperature with a solution of hydrogen bromide in a polar solvent. It is another example of electrophilic addition. $\endgroup$ – bon Nov 29 '15 at 14:04
  • $\begingroup$ Sorry, I meant to ask specifically why gaseous HBr doesn't react via electrophilic addition. See paragraph down from the one you quoted from. Many thanks, $\endgroup$ – Ted Rory Nov 30 '15 at 23:41
  • $\begingroup$ Presumably because HBr won't readily dissociate in the gas phase and so there are no ions to do the electrophilic addition. $\endgroup$ – bon Jan 22 '16 at 10:03

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