Which homologous series

Aromatic hydrocarbons, also known as arenes, are hydrocarbons that have at least one aromatic ring. Aromatic compounds contain the benzene unit. Benzene itself is composed of six C atoms in a ring, with alternating single and double C—C bonds:. For most compounds, information beyond the chemical formula will be needed to elucidate their structure. However, the ratio of C:H in a chemical formula can provide insights into the chemical structure. For example, let's look at some of the possible structures and chemical formulas for hydrocarbons containing six carbon atoms.

The saturated alkane has the highest ratio of hydrogen to carbon. The unsaturated alkene and the six membered alkane ring share the same chemical formula.

It is important to remember this relationship. The unsaturated alkyne has a lower ratio of hydrogen to carbon than alkenes with a second pi bond. Benzene rings have the lowest hydrogen ratio to carbon at Classify the following compounds are saturated or unsaturated.

For unsaturated hydrocarbons, refine the classification by indicating whether the compound is an alkene, alkyne, or arene. The number of carbons continuously bonded together is an important structural feature and is described using the Homologous Series. In first year organic chemistry, the first ten names of the Homologous Series are usually all that need to be memorized. Of course, your professor will set the standard. Serm Murmson is a writer, thinker, musician and many other things.

He has a bachelor's degree in anthropology from the University of Chicago. His concerns include such things as categories, language, descriptions, representation, criticism and labor. He has been writing professionally since What is the Bridge Stage of Glycolysis? What Does Glycolysis Yield? What Is the Difference Between a Monosaccharide and How to Find an Oxidation Number. What is a Dehydration Reaction? How to Calculate the Number of Isomers. Chemical Properties of Benzoic Acid.

A general formula is one in which the numbers of carbons are represented by the letter 'n' and the numbers of other elements as a function of 'n'. The general formula becomes C n H 2n. General Formula data. The chemical properties of the members of an homologous series are due to the presence or lack of functional groups. As all members of the same series have the same functional groups, then the chemical properties are similar. They are not identical because chemical properties are also modified by other factors, such as the position of the functional group, or branching in the carbon chain.

A case in point is the reactivity of the halogenoalkanes. This is known to depend on the position of the halogen atom on the carbon chain, as well as the shape of the carbon chain itself.

The physical properties of an homologous series show a trend as the series is ascended. This is due to the increased relative molecular mass, as each member of the series differs from the previous member by one -CH 2 - unit.