ANSWER WITH TRUE OR FALSE$//$ if not completed all you will get a downvote.

a$)$ When a vapor is cooled slowly at constant pressure, the temperature at which the first liquid droplet forms is the dew$-$point temperature of the vapor at the given pressure.

b$)$ When a liquid is decompressed $($pressure decreases$)$ at constant temperature, the pressure at which the last vapor bubble disappears is the bubble$-$point pressure of the liquid at the given temperature.

c$)$ At constant P$,$ the bubble point equals the dew point T$.$

d$)$ For a binary mixture, the bubble point P is higher than the dew point P at fixed T$.$

e$)$ When a liquid$/$vapor mixture is compressed at constant temperature, the pressure at which the last vapor bubble disappears is the bubble$-$point pressure of the liquid at the given temperature.