The Option 4 has same number of atoms but arranged differently so it is the isomer of the given compound.
Isomers are compounds that contain exactly the same number of atoms, i.e., they have exactly the same empirical formula, but differ from each other by the way in which the atoms are arranged.
By the definition of Isomer we can understand that we have to look for a compound that has same number of Carbon , Hydrogen and Chlorine atoms as that given .
Number of Carbon atoms = 3
Number of Hydrogen atoms = 6
Number of Chlorine atoms = 2
It can be seen that there are same number of Carbon , Hydrogen and Chlorine atoms in the fourth option , so Option 4 is the correct answer.
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