For example, an alkane with eight carbon atoms has the molecular formula C 8 H (2 × 8) + 2 = C 8 H 18. B. The principle of homology allows us to write a general formula for alkanes: C n H 2 n + 2. There are two ways of writing a condensed structural formula.For example, butane may be written as CH 3 CH 2 CH 2 CH 3 or CH 3 (CH 2) 2 CH 3. Alkanes have the general formula C n H 2n+2. The molecular formula of C 8 H 18 may even be applied to many alkanes, each of which has unique physical, chemical , and toxicological properties. Which of the following is not a proper condensed structural formula for a normal alkane? Name of this compound is ethane. The carbon is the central atom and makes four single covalent bonds to hydrogen atoms. Chapter 1 Alkanes 13 25 Isomers • Isomers — compounds having identical molecular formulas, but different arrangements of atoms. Straight-Chain Alkanes . The simplest alkane is methane (CH 4). It can be shown by following structural formula: If C = 2, then; C n H 2n+2 = C 2 H 2x2+2 = C 2 H 6. Methane is the simplest hydrocarbon and is shown with a structural formula, a ball-and-stick model, and a space-filling model. Compounds with the same molecular formula, and yet distinct structural formulas are known as structural isomers of that compound. The simplest alkane is methane, with the molecular formula CH 4. General formula of alkane is C n H 2n+2. The general formula for an alkane is C n H 2n+2 where n is the number of carbon atoms in the molecule. As these bonds are all single bonds, there is free rotation around all connections. Two compounds are considered as isomers if they have the: A) same molecular formula AND different structure. Alkanes do not decolourise red brown colour of bromine water. The following is a list of straight-chain and branched alkanes and their common names, sorted by number of carbon atoms. Alkanes generally burn in air with a blue and non-sooty flame. If C = 1, then; C n H 2n+2 = C 1 H 2x1+2 = CH 4. An alkane is a hydrocarbon in which the carbon atoms are connected by only single covalent bond. Cyclic alkanes will be considered separately later in this chapter. A) CH3CH2CH2CH3 B) CH2CH3CH3 C) CH3CH2CH2CH2CH3 D) CH3CH3 E) none of the above. For example, an alkane with 2 (n) carbon atoms, will have 6 (2n + 2) hydrogen atoms. Their adjacent atoms are connected with sigma bonds and form tetrahedral centers around the carbon atoms. alkenes: Structure of Alkanes. gives the molecular formulas and Lewis structure for the unbranched, or n-alkanes (n stands for normal). Using this formula, we can write a molecular formula for any alkane with a given number of carbon atoms. The general formula of alkane is C n H 2n+2. • Structural Isomers — the atoms in each molecule are connected in a different order. Name of this compound is methane. Alkanes undergo substitution reactions. 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