Which of the solutions have highest boiling point (explain) :-1M BaCl​_{2 ,}1M urea, 1M FeCL_{3 ,}1m nacl

FeCl₃ solution will have highest boiling point.

This is because it is ionic and will have highest number of solute particles which will decrease the vapour pressure and increase the bp of solution.
FeCl₃ will give 4 ions. It has maximum value of vantoff factor and has highest boiling point.