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QUESTION

# 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.