Addition Reactions of Alkenes Flashcards

All 5 cards in this deck

What happens to the carbon–carbon double bond in an addition reaction of an alkene?

e.g. ethene + bromine

Atoms add across the double bond, so it becomes a single carbon–carbon bond.

e.g. ethene + bromine gives $CH_2BrCH_2Br$ (dibromoethane).

What are the conditions and product for the reaction of an alkene with hydrogen?

e.g. ethene + hydrogen

A nickel catalyst (about 150 °C); the product is the corresponding alkane.

e.g. ethene + hydrogen $\rightarrow$ ethane

What are the conditions and product when an alkene reacts with steam?

e.g. ethene + steam

Steam with a catalyst, at high temperature and pressure; the product is an alcohol.

e.g. ethene + steam $\rightarrow$ ethanol

What is formed when an alkene reacts with chlorine, bromine or iodine, and what conditions are needed?

Two halogen atoms add across the double bond, giving a dihalogen compound (e.g. dichloro-, dibromo- or diiodo-); no catalyst or heating is needed.

True or false? When bromine reacts with ethene, both bromine atoms bond to the same carbon atom.

False. One bromine atom bonds to each of the two carbon atoms that were joined by the double bond.