Hi,
Except BF3 all other boron halides undergo hydrolysis to give orthoboric acid. The reaction of hydrolysis of BCl3 is given below :
BCl3(g) + 3H​2O(l) -----> B(OH)3 (aq) + 3HCl (aq)
BF3 does not undergo hydrolysis due to strong B-F bond in BF3 molecule.
Regards