What is the von Baeyer name of the compound shown?

Abicyclo[4.1.0]heptane
Bbicyclo[3.2.0]heptane
Cbicyclo[2.2.1]heptane
Dbicyclo[1.2.2]heptane

Answer: C

The compound is bicyclo[2.2.1]heptane (norbornane). The two bridgeheads are joined by bridges of 2, 2 and 1 carbons, quoted in decreasing order inside the brackets; the total of 7 carbons gives heptane. Writing [1.2.2] breaks the decreasing-order rule.

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