Chlorine Atoms Opposite Side of Main Double Bond

Question: Write an essay on Chlorine Atoms. Answer: As we can see that the chlorine atoms are locked in opposite side of main double bond this forms as Trans Dichloroethane and in other molecule chlorine atoms are locked in same side of major double bond. So its a Cis isomer of 1,2-dichloroethane. The both cis and trans 1,2- Dichloroethane are not constitutional isomers, this is due to the reason that the connectivity of atoms are same in both isomers, the difference is only due to arrangement of atoms in space latiice. It is basically stereoisomers but ofetne they are named as cis-trans isomers The cis isomer has a higher boiling point than the trans isomer because the cis is a polar molecule but the trans is a non-polar molecule. The C-Cl is a polar bond but because the two C-Cl are on the same side in the cis isomer it gives it a slightly negative charge and the other side would be slightly positive hence making it polar. In the trans isomer the C-Cl are on opposite sides, balancing out any polarity. There are stronger intermolecular forces, Cis has dipole-dipole which is stronger than Van-Der Waals forces in the trans isomer. The melting point in the trans isomer is higher than the cis isomer, this is because trans molecule is more symmetrical and better packing than cis. The cis isomer is a bending U-shape so has a lower melting point than trans molecule Its physical property is tending to be more different that its chemical properties. The cis 1,2-dichloroethane is more reactive than trans 1,2-dichloroethane because of unfavorable steric reaction of the cis isomers. References Atwood, J. and Steed, J, 2008.Organic nanostructures. Wenham [Germany]: Wiley-VCH. Orchin, M, 2005.The vocabulary and concepts of organic chemistry. Hoboken, N.J.: Wiley-Interscience.