A Level Chemistry OCR Practice Exam

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What is an alkyl group?

A hydrocarbon unit containing double bonds
An alkane with a hydrogen atom removed
A cyclic hydrocarbon structure
A class of saturated alcohols

The correct answer is: An alkane with a hydrogen atom removed

An alkyl group refers to a hydrocarbon moiety derived from an alkane by removing one hydrogen atom. This process creates a substituent that can bond to other atoms or groups, which is crucial in organic chemistry as it allows for the formation of various complex molecules. Alkyl groups can vary in size and structure, leading to different chemical properties depending on how many carbon atoms they contain and their arrangement. Choosing the correct answer, which describes the alkyl group as an alkane with a hydrogen atom removed, captures this key aspect of its formation and role in organic compounds, reflecting their nature as fragments of saturated hydrocarbons.