PPT-Alkanes and Cycloalkanes

Sources and Uses of Alkanes Petro leum which literally means rock oil is the main source of alkanes Petroleum is a mixture of hundreds of hydrocarbons mostly alkanes with varying numbers of carbons and varying degrees of branching. Conformational isomers can be shown using Newman Projections or Sawhorses Newman Projections The circle in the Newman projection represents the carboncarbon bond viewed one carbon in front of the other Bonds attached to the front carbon are shown by Basic Structure and Nomenclature. Graphic: www.lab-initio.com. First Ten Alkanes. Formula. Name. Formula. Name. CH. 4. Methane. C. 6. H. 14. Hexane. C. 2. H. 6. Ethane. C. 7. H. 16. Heptane. C. 3. H. 4-5. Rings larger that cyclohexane have more strain.. Bond angle distortion. Partial eclipsing of hydrogens. Transannular. steric repulsions. Medium sized rings adopt several conformations that are very close in energies, such as . Hydrocarbons are composed, as their name suggests mainly of carbon and hydrogen atoms, though some types have oxygen, nitrogen or . sulphur. atoms. . Hydrocarbons are divided into two groups, . Aliphatics. Alkanes. 240 . Chem. Chapter 2. 1. Hydrocarbons. 2. General Molecular Formula of Hydrocarbons. (Homologous Series) . 3. Carbon . Name . Molecular. Formula . Structural. Formula . 1. Methane . CH. 4. ALkanes. Chapter 10.2:. Structure, bonding and chemical reactions involving functional group inter-conversions are key strands in organic chemistry. Chapter 20.1:. Key organic reaction types include nucleophilic substitution, electrophilic addition, electrophilic substitution, and redox reactions. Reaction mechanisms vary and help in understanding the different types of reactions taking place.. Cycloalkanes have higher boiling points, melting points, and densities than their straight-chain analogs.. Increased London forces are due to more rigid and symmetric cyclic systems.. The smaller cycloalkanes with an odd number of carbon atoms have lower melting points than expected compared to cycloalkanes with an even number of carbon atoms. This is attributed to crystal-packing forces between the two types of cycloalkanes.. Straight chain alkanes will have symmetrical . electronegativities. so they will behave as non-polar molecules. Since ‘like dissolves like’ the alkanes will all be soluble in . eachother. However… since water is polar; alkanes will NOT dissolve in water… think of pouring oil on water. . Alkanes. Dr. . Shatha. I . Alaqeel. 1. 108 . Chem. Learning Objectives. Chapter one discusses the following topics and the student by the end of this chapter will:. . Know the classification of hydrocarbon. Mainly carbon and hydrogen atoms.. Many organic compounds occur naturally.. Thousands more can be synthesized by man.. Ch. 10: Organic Chemistry. Butane versus . NaCl. Inorganic. Organic. NaCl. , 58.5 g/mol. Introduction. Alkanes are saturated hydrocarbon, that is they contain only . carbon-hydrogen. (C-H) and . carbon-carbon. (C-C) single bonds. The general formula of alkane = C. n. H. 2n+2 . Where n is the number of carbon. Conformational and Geometrical Isomerism. Hydrocarbons. . are . compounds that contain only carbon and hydrogen. . There are three main classes of hydrocarbons, based on the types of carbon–carbon bonds present. . 1. Alkanes and Cycloalkanes. Hydrocarbons. . (contain only carbon and hydrogen). Saturated:. (Contain only single bonds). . Alkanes. (C. n. H. 2N 2. ). . Cycloalkanes. (C. n. H. 2N . ). b). 12.1 Organic and Inorganic Compounds Organic vs. Inorganic • Organic chemistry : Study of hydrocarbons (only carbon and hydrogen atoms) and their various derivatives. – Examples: natural gas, pe