Ionic compounds typically involve a metal and a non-metal, while molecular compounds involve non-metals only. Here's the breakdown:

Likely ionic compounds:
1. NaBr (Sodium bromide)
2. BaF2 (Barium fluoride)
3. CsCl (Cesium chloride)

Likely molecular compounds:
1. CH4 (Methane)
2. CCl4 (Carbon tetrachloride)
3. ICl (Iodine chloride)
4. NF3 (Nitrogen trifluoride)

The presence of a metal combined with a non-metal usually indicates an ionic compound, while the presence of only non-metals indicates a molecular compound.