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Cyclobutane

Cyclobutane

Cyclobutane has less angle strain since its C-C-C angles are about 90o which is closer to 109.5o.  There is also significant torsional strain, however since it has a 4th carbon in it ring (an additional degree of freedom) it can relieve some of the torsional and angle strain by puckering.  Cyclobutane is less stable than butane.