Answer :
Ring strain typically relates to the additional energy in a cyclic compound as a result of angle strain. Generally, smaller-sized cycloalkanes like cyclopropane and cyclobutane have the highest strain due to larger angle strain.
It seems like you are asking for an order of compounds based on their ring strain. Ring strain in organic chemistry relates to the additional energy present in cyclic compounds, especially small ones, due to the angle between their covalent bonds and the angles required for perfect hybridization, normally 109.5º for sp3, 120º for sp2 and 180º for sp. Compounds with more strain generally have higher reactivity.
Without specific compounds given, it's hard to give a distinct order, but one general rule is that: Cyclopropane and cyclobutane are the most strained since they have to significantly deviate from the optimal 109.5º bond angle due to their small size. Cyclohexane ring is the least strained as it can adopt a chair conformation which allows for almost all of the carbon atoms to have an ideal 109.5º bond angle reducing its strain.
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