Alkanes are a type of aliphatic hydrocarbons characterized by single covalent bonds between carbon atoms in their chain, also known as saturated hydrocarbons.

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Linear polymers have their monomer units linked in a straight chain. High density polythene and PVC are examples of linear polymers, whereas low density polythene is a branched polymer. Therefore, both A and C are correct examples of linear polymers.

A compound with two halogen atoms bonded to two adjacent carbon atoms is referred to as a Vicinal dihalide. In this structure, each carbon atom is bonded to one halogen atom, and the other carbon atom. Examples include chlorovinyl chloride (CH2=CHCl) and bromovinyl bromide (CH2=CHBr). The term 'vicinal' originates from the Latin word for nearby, emphasizing the close proximity of the halogen atoms to one another on the carbon chain.

The adsorption theory of catalysis is specifically applicable to heterogeneous catalysis, where the reactants are in a different phase from the catalyst (usually a solid surface). The mechanism involves the diffusion of reactants to the surface, adsorption onto active sites, chemical reaction on the surface, and subsequent desorption of products, which frees the active sites for further reaction cycles.

Physical adsorption (physisorption) is an exothermic process involving weak van der Waals forces between the adsorbate and the adsorbent. According to Le Chatelier's principle, decreasing the temperature favors exothermic processes. Therefore, physisorption is more pronounced at lower temperatures, as higher temperatures provide sufficient thermal energy to overcome these weak attractive forces, leading to desorption.

In 1823, Johann Wolfgang Döbereiner discovered that finely divided platinum (Pt) could catalyze the oxidation of hydrogen gas in air. This was one of the earliest recorded observations of heterogeneous catalysis, where the metal surface facilitates a chemical reaction without being consumed itself. This discovery laid the groundwork for modern catalytic science and the development of industrial processes involving precious metal catalysts.

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It functions by providing an alternative reaction pathway with a lower activation energy. By reducing the energy barrier, a greater fraction of reactant molecules possess sufficient energy to collide effectively, thereby accelerating the reaction rate.

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The Arrhenius equation can be linearized by plotting log k vs. 1/T, yielding a straight line with a negative slope. A negative slope indicates that as 1/T increases (or T decreases), log k decreases. This relationship results in the line extending into the II and IV quadrants, where II represents negative 1/T values (or positive T) and negative log k, and IV represents positive 1/T (or positive T) and negative log k.