Hydrogen bromide with ethene

Earlier we looked at the formation of 2-bromopropane when hydrogen bromide was added to propene, and also the formation of ethanol from ethene reacting with dilute sulphuric acid. Suggest what would be the product of the reaction between propene and dilute sulphuric acid. 

Write an equation for the reaction of ethene with hydrogen bromide. Name the product. 

The reaction is faster with electron-rich alkenes. The rate constants for addition of bromine to a series of alkenes were found to increase in the order ethene < propene < 2-butene isobutene < 2-methyl-2-butene. In other words, each methyl group that replaces a hydrogen atom on ethene increases reactivity. The addition of bromine to substituted ethenes in methanol with added sodium bromide can be correlated to the equation... 

Hydrogen halides (HCl, HBr, etc.) react with alkenes to produce halogenoalkanes. These reactions take place rapidly in solution at room temperature. For example, ethene reacts with hydrogen chloride to form chloroethane, and but-Z-ene reacts with hydrogen bromide to form Z-bromobutane ... 

The equihbrium constant, K, is a measure of the tendency of a chemical reaction to go from reactants to products in the direction written. If the equihbrium constant is much greater than 1.0, little reactant is present at equihbrium, and the reaction has a large tendency to occur. On the other hand, if the equihbrium constant is much less than 1.0, htde product is present at equihbrium, and the reaction has a small tendency to occur in the direction written. Consider the equihbrium constant for the addition reaction of ethene with hydrogen bromide at 25°C. 

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