What is the structural formula of cyclobutane?

Cyclobutane, ##C_4H_8##, is a four-membered carbocycle.

Cyclobutane has 2 hydrogen atoms less than does butane, ##C_4H_10##. A chemist would say that the ring has one degree of unsaturation with respect to the parent alkane. The ring junction has reduced the hydrogen count by two.
A degree of unsaturation corresponds to an unsaturated bond, ##C=O## or ##C=C## or a RING, i.e. a ##C-C## junction.

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