Problem: Which of these structures has the most torsional (eclipsing) strain?a) 1,1-dimethylcyclobutaneb) 1,1,3,3,5,5-hexamethylcyclohexanec) staggered butane

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  • Torsional strain  present in cyclic molecules having eclipsing conformation due to overcrowding of the electron pair 
  • Torsional strain increases with the number of eclipsing hydrogens in a molecule. 
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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