Please verify if the answer below is correct
2--When pressure is added to a gas, it can be liquified (condensed). Which of the following gases
requires the least amount of pressure to liquify? Most?
a) methane, CH4
b) ammonia, NH3
c) ethane, C2H6

Most amount of pressure to liquify===> CH4
Least amount of pressure to liquify===> NH3

It is correct

Gas with highest intermolecular attractive forces will need minimum Pressure - NH3 with H- bonding
Gas with lowest intermolecular attractive forces will need highest  Pressure - CH4 - Dispersion forces.