Question

Write the total number of isomers in ${\mathrm{C}}_6{\mathrm{H}}_3{\mathrm{Cl}}_3$.

Answer 1

${\mathrm{C}}_6{\mathrm{H}}_3{\mathrm{Cl}}_3$

• Trichloro benzene is the name given to the compound ${\mathrm{C}}_6{\mathrm{H}}_3{\mathrm{Cl}}_3$. It has six carbon atoms, three hydrogen atoms, and three chlorine atoms.
• Isomers are molecules with the same chemical formula but distinct structural formulae.
• There are three possible isomers of trichlorobenzene. They are as follows:

The location of the chlorine atoms on the benzene ring is the only distinction between these isomers.

• Chlorine atoms are located on the first, second, and third carbon atoms of the benzene ring in the first isomer $1,2,3$ – trichlorobenzene.
• Chlorine atoms are positioned on the first, second, and fourth carbon atoms of the benzene ring in the second isomer $1,2,4$ – trichlorobenzene.
• Chlorine atoms are positioned on the first, third, and fifth carbon atoms of the benzene ring in the third isomer $1,3,5$ – trichlorobenzene.

Hence, there is three total number of isomers in ${\mathrm{C}}_6{\mathrm{H}}_3{\mathrm{Cl}}_3$.