This is because cyclohexane is not planar. it exists in both boat and chair form(it keeps flipping from one structure to another at RT). and 1,4 (trans or cis) will be meso due to plane of symmetry.
Happines is like a butterfly;
the more you chase it,
the more it will elude you,
but if you turn you attention to other things,
it will come and sit softly on your shoulders...
Moderation Team
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