Life, as we know it, requires liquid water. There would certainly be none of this on the four gas giants which are so far from the sun.

Ice caps have been discovered on Mars but not liquid water yet. The surface of Mars does, however, show signs of erosion by water. Some form of life could have existed there in the past.

It is very unlikely that life could exist in the hot thick carbon dioxide atmosphere on Venus.

Mercury spins very slowly so that its surface is either incredibly cold or is blasted by the sun.

all pics NASA