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Why is a C4 ring impossible? - Chemistry Stack Exchange A four C ring does exist in many compounds, but it is not possible for double bonds Cumulated double bonds C=C=C C = C = C must be linear, in 1 line They can be bent a little, but it would cause the strain in the bonds, causing instability They definitely cannot be bent in right angles The right angle geometry excludes possibility of overlap of orbitals to form such double bonds