Shortages (in the technical sense) may be caused by: 1  Price ceilings, a type of price control which involves a government-imposed limit on the price of a product service. 2  Anti-price gouging laws. 3  Government ban on the sale of a product or service, such as prostitution or certain recreational drugs.
Noun. 1. addition reaction-a chemical reaction in which one molecule is added to another. chemical reaction, reaction - (chemistry) a process in which one or more substances are changed into others; there was a chemical reaction of the lime with the ground water. 1  Facebook. 2  Twitter.
In other words, ethene undergoes addition reactions. For example, using a general molecule X-Y. . . Summary: electrophilic addition reactions. An electrophilic addition reaction is an addition reaction which happens because what we think of as the important molecule is attacked by an electrophile.The important molecule has a region of high electron density which is attacked by something carrying some degree of positive charge.ackground. Electrophilic addition happens in many of the reactions of compounds containing carbon-carbon double bonds-the alkenes. The structure of ethene. We are going to start by looking at ethene, because it is the simplest molecule containing a carbon-carbon double bond.