Alkanes undergo substitution reactions. For example, an alkane with 2 (n) carbon atoms, will have 6 (2n + 2) hydrogen atoms. General formula of alkane is C n H 2n+2. Name of this compound is methane. Alkanes do not decolourise red brown colour of bromine water. As these bonds are all single bonds, there is free rotation around all connections. The general formula of alkane is C n H 2n+2. gives the molecular formulas and Lewis structure for the unbranched, or n-alkanes (n stands for normal). Structure of Alkanes. A) CH3CH2CH2CH3 B) CH2CH3CH3 C) CH3CH2CH2CH2CH3 D) CH3CH3 E) none of the above. Which of the following is not a proper condensed structural formula for a normal alkane? Alkanes generally burn in air with a blue and non-sooty flame. The principle of homology allows us to write a general formula for alkanes: C n H 2 n + 2. Name of this compound is ethane. • Structural Isomers — the atoms in each molecule are connected in a different order. Compounds with the same molecular formula, and yet distinct structural formulas are known as structural isomers of that compound. There are three structural isomers possible with the formula C 5 H 12 as shown below. It is also possible to write the higher members of alkanes using the same principles applied as above. The general formula for an alkane is C n H 2n+2 where n is the number of carbon atoms in the molecule. Using this formula, we can write a molecular formula for any alkane with a given number of carbon atoms. B. 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. 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. alkenes: Methane is the simplest hydrocarbon and is shown with a structural formula, a ball-and-stick model, and a space-filling model. 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. Cyclic alkanes will be considered separately later in this chapter. Their adjacent atoms are connected with sigma bonds and form tetrahedral centers around the carbon atoms. The simplest alkane is methane, with the molecular formula CH 4. If C = 1, then; C n H 2n+2 = C 1 H 2x1+2 = CH 4. Alkanes have the general formula C n H 2n+2. The carbon is the central atom and makes four single covalent bonds to hydrogen atoms. For example, an alkane with eight carbon atoms has the molecular formula C 8 H (2 × 8) + 2 = C 8 H 18. An alkane is a hydrocarbon in which the carbon atoms are connected by only single covalent bond. Straight-Chain Alkanes . The following is a list of straight-chain and branched alkanes and their common names, sorted by number of carbon atoms. 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