Question

What is the difference between displacement and double displacement reactions?

Answer 1

We have to know that during a chemical reaction, we can define reactants are those substances which react and products are the substances which are formed during chemical reactions. Displacement and double displacement reactions are one of six types of chemical reactions.

Complete answer:
Displacement reaction:
We can say a chemical reaction where a more reactive component replaces an element which is less reactive from aqueous salt solution is known as displacement reaction.
We can give the general formula of displacement reaction as $X + YZ \to XZ + Y$
It is likewise called a replacement reaction.
Double Displacement reaction:
We can say a chemical reaction where exchange of ions takes place between two reactants for the formation of new compounds is known as double displacement reaction.
We can give the general formula of double displacement reaction as $XY + ZA \to XY + YA$
It is likewise called a metathesis reaction.
We can tabulate the differences between displacement and double displacement reactions as follows,

Displacement reaction	Double displacement reaction
We can say a displacement reaction is a reaction where a chemical species of a molecule is displaced by chemical species of another molecule.	We can say in double displacement reactions, ions of two different ionic species are exchanged.
We have to know that only one chemical reactant is displaced.	We have to know that two chemical species are displaced.
In the displacement reactions, replacement of one chemical species is seen.	In the double displacement reactions, replacement of two chemical species is seen.
These reactions take place based on chemical reactivity of species.	These reactions occur when exchangeable ions are found in the compounds.

Note:
We have to know that double displacement reactions could be further classified into acid-base reactions and precipitation reactions. In acid base reactions, acid and base reacts to form salt and water whereas precipitation reactions, a precipitate and soluble salt are obtained as products.