Boardworks AS Chemistry Alkenes Teacher notes See the ‘ Bonding and Intermolecular Forces ’ presentation for more information about co-ordinate bonds.
Boardworks AS Chemistry Alkenes Photo credit: JoLin / shutterstock.com
Boardworks AS Chemistry Alkenes Photo credit: Jerry Mason / Science Photo Library Experiment demonstrating an addition reaction. In the flask at left is bromine water, with a characteristic orange colour. When added to cyclohexene, the bromine water loses its colour. This is because the bromine attacks and breaks the double bond of cyclohexene, bonding with it and forming the colourless 1, 2- dibromocyclohexane.
Boardworks AS Chemistry Alkenes
Boardworks AS Chemistry Alkenes Teacher notes In the reaction between ethene and sulfuric acid, ethyl hydrogen sulfate is sometimes written as CH 3 CH 3 OSO 2 OH or CH 3 CH 2 HSO 4 .
Boardworks AS Chemistry Alkenes Teacher notes The major product can be predicted using Markovnikov’s rule. This states that when a substance H–X reacts with an alkene by electrophilic addition, the major product is the one in which the hydrogen atom is bonded to the carbon atom to which the greatest number of hydrogen atoms were initially bonded. This rule was established in 1870 by the Russian chemist Vladimir Markovnikov (1837–1904). Students could be asked to draw the reaction mechanisms for this reaction, showing the carbocation intermediates for both the major and minor products. Likewise, if propene reacts with concentrated sulfuric acid followed by warm water, the major product is propan-2-ol, with propan-1-ol being a minor product.