Problem: Which of these structures has the most torsional (eclipsing) strain?a) 1,1 -dimethylcyclobutane b) 1,1,3,3,5,5-hexamethylcyclohexane c) staggered butane 

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Torsional strain → neighboring Cs has groups that overlap in space

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Which of these structures has the most torsional (eclipsing) strain?

a) 1,1 -dimethylcyclobutane 

b) 1,1,3,3,5,5-hexamethylcyclohexane 

c) staggered butane