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    does anything happen when an acidified dichromate is added to an alkene OR alkane
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    Alkanes are too inert to be oxidised without some kind of transition metal catalyst so you definitely won't get any reaction with an alkane. I don't think the alkene will react either as potassium dichromate isn't strong enough but it will react with acidified potassium manganate which is a stronger oxidising agent. In this case you'll end up with a 1,2 diol and I think this reaction is on the A level syllabus.
 
 
 
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