Q: why is sulphuric acid not used during reaction of alcohols using KI??
umm....generally we use it like:
R-OH + NaBr + H2SO4 ----> R-Br + NaHSO4 + H2O!!
1Sulfuric acid could cause the competing reaction, elimination, to occur giving impurities of alkene with your desired reaction products
the reaction would also be explosive.
1no..i dont think that is the answer..I think it is beacuse in the case of Iodine..sulphuric acid CAN act as AN OXIDISING AGENT..so eventually Iodine escapes as I2 !
1yups js genius is right....sulphuric acid acts as oxidising agent.....and oxidises strong reducing agent HI to I2 (which is therefore producd using KI and H3PO3)
also reaction could b explosive
and what madhumita has mentioned about the products being elimination products...is actually the reason why sec and tert bromides and iodides cant b prepared by using sulfuric acid
39Wow yaar...everyone has become self sufficient in organic...:P
