Question

define homologous series of organic compounds. list its two characteristics. write the name and formula of the first member of the series of alkenes.___

Answer 1

The homologous series of organic compounds is a family of compounds where each member differs by a specific CH2 unit, with predictable property variations. The first member of the alkene series is ethene (C2H4), featuring a carbon-carbon double bond.

Step-by-step explanation:

Definition of Homologous Series of Organic Compounds

A homologous series of organic compounds is a sequence of compounds where each member differs from the previous one by a repetitive unit, commonly a CH2 group. This definition allows the organization of numerous organic compounds into families with similar structural features and predictable variations in their physical and chemical properties.

Characteristics of Homologous Series

• The common differentiating factor among members is a fixed group, generally a CH2 group, known as the methylene unit.
• The series reflects a gradual change in properties like boiling point, melting point, and solubility, following a predictable trend as the chain length increases.

First Member of the Series of Alkenes

The first member of the alkene series is ethene, with the formula C2H4. Alkenes are characterized by having at least one carbon-carbon double bond, and ethene has the simplest structure with just one double bond between the two carbon atoms.