Final answer:
The total number of different constitutional isomers for the compound C₂H₄Br₂ is three.
Step-by-step explanation:
The molecular formula C₂H₄Br₂ represents a compound with two bromine atoms attached to a chain of four carbon atoms. To identify the total number of different constitutional isomers, we need to consider the different ways the carbon atoms can be arranged in the molecule.
One possible constitutional isomer is 1,2-dibromoethane, where the two bromine atoms are attached to adjacent carbon atoms. Another isomer is 1,1-dibromoethane, where the bromine atoms are attached to the same carbon atom. Finally, we have 1,1,2-tribromoethane, where one bromine atom is attached to one carbon atom and the other two bromine atoms are attached to the adjacent carbon atom.
Therefore, the total number of different constitutional isomers is three.