OCR Chemistry Definitions 2.1

Question	Answer
Homologous Series	a series of organic compounds having the same functional group but with each successive member differing by CH2
Functional Group	a group of atoms responsible for the characteristic reactions of a compound
Structural Isomers	compounds with the same molecular formula but different structural formulae
Stereoisomers	compounds with the same structural formula but with a different arrangement in space
E/Z Isomerism	an example of stereoisomerism, in terms of restricted rotation about a double bond and the requirement for two different groups to be attached to each carbon atom of the C=C group
Cis-Trans Isomerism	a special case of EIZ isomerism in which two of the substituent groups are the same
Hydrocarbon	compound of hydrogen and carbon only
Radical	a species with an unpaired electron
Electrophile	an electron pair acceptor

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