Experiments at very low temperatures near 10k have demonstrated that there are actually two distinct isomersof 1,2-dideuteriocyclobutadiene, the compound with molecular formula c4h2d2.these isomers have been spectroscopically determined to attain a rectangular structure, with two long c-c bonds and two short c-c bonds, rather than the expected square with all c-c bonds of equal length. draw the structures of these two isomers, and then provide a justification for why the structures might prefer the rectangular molecular shape to the square.