Probably nothing, because hexane unable to solvate highly polar molecule HF.

nothing will happen

Dharshini,

I agree with the above answers, however I would like to add that

In industry, combining cracking,  and alkylation units can result in product which is called alkylate and is composed of a mixture of high-octane. Alkylate is a premium gasoline blending stock because it has exceptional antiknock properties and is clean burning. See,

--- http://en.wikipedia.org/wiki/Alkylation

Good luc

HF is generally supplied as an aqueous solution, so won't be miscible with hexane - you'll get a layer of hexane on top of the aqueous HF solution. Naturally, beware that HF is highly toxic and very corrosive, and needs special precautions to handle - it's not the strongest acid but will etch/dissolve glass and can absorb through skin and cause burns deep below the skin. Special creams must be on hand in case of emergencies.

Nothing, I'll repeat the previous ansvers but with a little remark/ It is a very goog metod to immedeatelly extraction of the finish target product from the reaction with HF, if this product is SESITIVE to an excess of HF and decomposes in other case. I have personally done such trick ("N,N-Bisdifluoromethylanilines" Journ. Fluor. Chem. 01/1996; 76(1):95-98. DOI: 10.1016/0022-1139(95)03350-5) Full text is addded to my profile, one of the oldest articles