Answer :
Cyclopropane is the molecule having the most ring strain and Cyclohexane has the least ring strain attached.
Cyclopropane usually contains a high degree of angle strain( because of presence of bond angles - distorted from the ideal 109.5 degrees to roughly 60 degrees). This results in a highly unstable and strained ring. On the other hand, bond angles of cyclohexane are closer to the ideal 109.5 degrees, providing a more stable and relaxed ring structure.
Bicyclic molecules consists of addictive strings in respect to each and every individual ring. Thus, if one bicyclic molecule is containing few fused cyclopropane rings, it will ultimately have a higher / increased ring strain when compared with a molecule containing fused cyclohexane rings.
To learn more about bicyclic molecules and strings,
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