How Can Open Chain C3H6 Exist if Cyclopropane Is More Stable?

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Shivam123
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The VSEPR theory states that whenever a molecule forms, it orients itself in space such that the repulsion is min and stability is maximum..now when propane forms their are 2 structures known one is propane(open chain) other is cyclopropane..

If VSEPR theory is not wrong then its cyclopropane where there's max stability and thus it's only cyclopropane which should exist as just when C3H6 will form it will orient itself to undergo min repulsion and that's cyclopropane..so how can "open chain" C3H6 exist?
 
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What makes you think cyclopropane is the most stable molecule? What about bond angles?