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You can either go for a 1 ton AC or a 1.5 ton AC depending upon the amount of light that enters the room, area and direction of windows, the floor on which your room is situated, number of people occupying the room and the number of lights.
A ton of air conditioning is not related to weight. A ton of cooling is equivalent to 12,000 BTU or 3.5 KW. This is the measurement unit for moving thermal energy. A 1.5 ton AC will move 3/4 of the amount of heat energy as a 2 ton unit, the 2 ton unit will be able to cool a given space faster.