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When a system is in equilibrium, the entropy is maximum, and the change in entropy, ?S = 0.Entropy, like any other thermodynamic property such as internal energy U and enthalpy H is a state function and ?S is independent of path.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.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.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).We may now formulate another postulate: in an isolated system, there is always a tendency for the systems' energy to become more disordered or chaotic and this could be a criterion for spontaneous change ! At this point, we introduce another thermodynamic function, entropy denoted as S.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.To form a mental picture, one can think of entropy as a measure of the degree of randomness or disorder in the system.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.Though these materials have now become common, excessive use of polythene and polypropylene is a matter of great concern for all of us.Decrease of regularity in structure would mean increase in entropy.The above mentioned disorder is the manifestation of entropy.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.For a given substance, the crystalline solid state is the state of lowest entropy (most ordered), The gaseous state is state of highest entropy.