Help pls

Im a Student and a classmate game me some practice examples to study

And I need help choosing If they are possible, specifically the first one, since the methyl Group on 4 confuses me on how to choose the priority

  1. E-2,4-Dimethyl-3-propylpent-2-ene

  2. Z-2-Ethylprop-1-ene

  3. Z-2,3-Dibromopent-3-ene (Not possible)

Im a Student and a classmate game me some practice examples to study

And I need help choosing If they are possible, specifically the first one, since the methyl Group on 4 confuses me on how to choose the priority

  1. E-2,4-Dimethyl-3-propylpent-2-ene

  2. Z-2-Ethylprop-1-ene

  3. Z-2,3-Dibromopent-3-ene (Not possible)