What would be the IUPAC name of the given compound?
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1 − c y c l o b u t y l p e n t a n e is the correct IUPAC name of the compound because the cyclic part of the compund has 4 carbons while the chain part has 5 carbons.
According to IUPAC rules for nomenclature, the longest carbon chain has to be selected. Hence the answer.