A good refrigerant must have a high boiling point is FALSE.
Explanation:
It has the low boiling point. It should have the ability to turn into gas in absorption of heat.
If the refrigerant need to be good and ideal must have the boiling point low and freezing point also low. The low boiling point makes the refrigerant to be good as it needs to boil when the temperature crosses the limit.
It has the high critical pressure and temperature in order to avoid the large power requirements of the compressor in the refrigerator.