I wanted to optimise the geometry of a large molecule than I wanted to test this first since I am not experienced in computational chemistry, I tried to optimize first the 1,2-dichloroethene and chose a Cis starting structure, of course the minimum energy must be with Tran structure however the optimized geometries kept the Cis! with small molecules I guess it's easy to choose a good starting configurations but when the system is large I am afraid to have a poor optimisation without noticing this, I am sure the community of computation chemists will have an answer to this, thank you.
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