orgo question-protonation

[yalla22]

what does h30+ do when it reacts with double bonds?(like c=c and c=o)?

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[Bones2008]

H30+, like any acid, donates a proton, though you'd have to have more to the reaction than just protonated water and a double bond to get it to do anything at all.

 

[liverotcod]

Acid can hydrolyze an alkene to an alcohol, with Markovnikov orientation, but it's not generally used in lab synthesis. Protonation makes a carbonyl more reactive.

 

[yalla22]

what is h3o+ is the only compound shown to be reacting with this gigantic molecule containing a bunch of c=o's, etc...

 

[liverotcod]

Need more specifics. What molecule?

 

[notJERRYFALWELL]

The O of the C=O will be protonated by the H+, and then the H20 will attack the C of the C=O. Depending on the nature of the carbonyl's r group(s), it may or may not undergo elimination (by eliminating an r group, or opening up a ring), as the H2O loses one proton, forming a carboxylic acid.

It be easier to help if we had specifics, not just a general case, because different conditions warrant different mechanisms, but generally, the above will happen. Simple addition/elimination.