A Level Chemistry OCR Practice Exam

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What characterizes an alicyclic hydrocarbon?

  1. A hydrocarbon with carbon atoms in branched chains

  2. A hydrocarbon with carbon atoms in a ring structure

  3. A saturated hydrocarbon with no rings

  4. A hydrocarbon consisting of single carbon to carbon bonds

The correct answer is: A hydrocarbon with carbon atoms in a ring structure

An alicyclic hydrocarbon is characterized by having carbon atoms arranged in a ring structure. This means that the carbon atoms in an alicyclic hydrocarbon form a closed loop, differentiating it from linear and branched chain hydrocarbons. While the term "alicyclic" suggests that the molecule is cyclic, it can also possess saturation; that is, there can be only single bonds between carbon atoms. While options related to branched chains, saturated hydrocarbons without rings, or single carbon-to-carbon bonds may describe certain types of hydrocarbons, they do not define what makes an alicyclic hydrocarbon unique. Specifically, the presence of a cyclic arrangement of carbon atoms is what sets alicyclic hydrocarbons apart from other types of hydrocarbons, such as aliphatic ones, which can be linear or branched but do not include rings in their structure.

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