it's a very powerful dehydrating reagent .
no more clues .
after a disastrous previous q. here's Q which is quite correct and worth a try .
An organic compound A on reaction with AlPO4 forms B . B on reaction with A gives C . C on reaction with mesitylene in presence of AlCl3 gives a ketone . this on reduction with Zn/HCl gives a hydrocarbon . what is the molecular mass of the hydrocarbon.
it's easy and all info neede for problem solving is given plz try