There are five structural isomers of C3H5Cl3:

1,1,1- Trichloropropane:

• All three chlorine atoms are bonded to the first carbon atom in the chain.
• Cl-CH2-CH2-CH2-Cl (structural formula)

1,1,2- Trichloropropane:

• Two chlorine atoms are bonded to the first carbon, and one chlorine atom is bonded to the second carbon.
• Cl-CH2-CH(Cl)-CH2-Cl (structural formula)

1,2,2- Trichloropropane:

• One chlorine atom is bonded to the first carbon, and two chlorine atoms are bonded to the second carbon.
• Cl-CH2-CH(Cl)-CH(Cl)-Cl (structural formula)

1,1,3- Trichloropropane:

• Two chlorine atoms are bonded to the first carbon, and one chlorine atom is bonded to the third carbon.
• Cl-CH2-CH2-CH(Cl)-Cl (structural formula)

1,2,3- Trichloropropane:

• One chlorine atom is bonded to each of the first three carbon atoms in the chain.
  
  
• Cl-CH2-CH(Cl)-CH2-Cl (structural formula)
  
  Note: This isomer has a chiral center at the second carbon atom, meaning it can exist as a pair of enantiomers
  
  I hope it helps!