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Decrease of regularity in structure would mean increase in entropy.Though these materials have now become common, excessive use of polythene and polypropylene is a matter of great concern for all of us.The greater the disorder in an isolated system, the higher is the entropy.The above mentioned disorder is the manifestation of entropy.We have seen that for a system, it is the total entropy change, ?Stotal which decides the spontaneity of the process.Therefore, for most of the chemical reactions there are changes in both enthalpy and entropy.The change in entropy accompanying a chemical reaction may be estimated qualitatively by a consideration of the structures of the species taking part in the reaction.If the carbon chain is unsaturated, then the final 'ane' in the name of the carbon chain is substituted by 'ene' or 'yne' as given in Table For example, a three-carbon chain with a double bond would be called propene and if it has a triple bond, it would be called propyne.Common and IUPAC names of a few members of alkyne series are given in Table 1 You have already learnt that ethyne and propyne have got only one structure but there are two possible structures for butyne – but-1-yne and but-2-yne.As far as a chemical reaction is concerned, this entropy change can be attributed to rearrangement of atoms or ions from one pattern in the reactants to another (in the products).It is clear from the discussion in previous sections that neither decrease in enthalpy nor increase in entropy alone can determine the direction of spontaneous change for these systems.Here, we have considered both terms together for spontaneity: energy (in terms of ?H) and entropy (?S, a measure of disorder) as indicated earlier.?rG0 also depends upon ?rS0, if the changes in the entropy of reaction is also taken into account, the value of K or extent of chemical reaction will also be affected, depending upon whether ?rS0 is positive or negative.Thus, Gibbs energy change = enthalpy change – temperature × entropy change, and is referred to as the Gibbs equation, one of the most important equations in chemistry.We can say that entropy for a spontaneous process increases till it reaches maximum and at equilibrium the change in entropy is zero.