Equal quantities of different liquids are placed in closed manometers at 20° c. which liquid has the highest vapor pressure?

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Vapor pressure is defined as  the pressure exerted by a vapor which is in equilibrium with liquid, at a given temperature, in a closed system. If vapor pressure is high, it suggest that escaping tendency of liquid is high. This will result in higher pressure level in manometer. 

In present case liquid A (i.e option F) has highest level in manometer, suggesting that it has highest vapor pressure. 

Noble gases. The ones on the right side.