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# Which of the following equations is not an example of a single displacement reaction?(A) $2Al+F{{e}_{2}}{{O}_{3}}\to A{{l}_{2}}{{O}_{3}}+2Fe$(B) $Ca+C{{l}_{2}}\to CaC{{l}_{2}}$(C) $2KI+C{{l}_{2}}\to 2KCl+{{I}_{2}}$(D) $2Na+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}$

Last updated date: 24th Jun 2024
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Hint: Displacement reaction is a type of reaction in which part of one reactant is replaced by another reactant. It is of two types: Single displacement reaction and double displacement reaction.

Complete step by step solution:
Displacement reaction is the reaction in which reactant of one part is replaced by the reactant of another part. There are two types of displacement reactions:
Single displacement reaction: In this type of reaction one reactant replaces the part of the other.
$XY+Z\to XZ+Y$
Double displacement reaction: It is the reaction where the cations and anions in the reactant interchange with each other to form products.
$AB+CD\to AD+CB$
$2Al+F{{e}_{2}}{{O}_{3}}\to A{{l}_{2}}{{O}_{3}}+2Fe$: It is a displacement reaction in which Fe is replaced by Al and $F{{e}_{2}}{{O}_{3}}$ is changed in to$A{{l}_{2}}{{O}_{3}}$.
$Ca+C{{l}_{2}}\to CaC{{l}_{2}}$: This type of reactions are known as composition reactions in which two substances combine to make a single substance.
$2KI+C{{l}_{2}}\to 2KCl+{{I}_{2}}$: This is also a displacement reaction in which I (Iodine) is replaced with Cl (Chlorine).
$2Na+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}$: We can also consider this reaction as a single displacement reaction in which one reactant is combined with another one like OH molecule is attached with Na (Sodium).

Thus, the correct answer is (B).

Note: (A),(C) and (D) are single displacement type reactions in which one reactant replaces the path of another. Reaction c is a composition type reaction. Displacement reactions can also be known by two other names called replacement reaction or metathesis reaction.