Which of the following compounds has lower boiling point?

A gas is allowed to expand in an insulated container against a constant external pressure of 2.5 atm from $$2.5 \mathrm{~L}$$ to $$4.5 \mathrm{~L}$$, the change in internal energy of the gas in joules is

Which of the following solutions shows positive deviation from Raoult's law?

Which of the following conjugate bases is stabilized to greater extent due to solvation of ammonia and amines?