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* Substitution Reaction: In a substitution reaction, a functional group in a particular chemical compound is replaced by another group. In organic chemistry, the electrophilic and nucleophilicsubstitution reactions are of prime importance. Organic substitution reactions are classified in several main organic reaction types depending on whether the reagent that brings about the substitution isconsidered an electrophile or a nucleophile, whether a reactive intermediate involved in the reaction is a carbocation, a carbanion or a free radical or whether the substrate is aliphatic or aromatic.* Addition Reaction: An addition reaction, in organic chemistry, is in its simplest terms an organic reaction where two or more molecules combine to form a larger one.

* HydrogenationReaction: Hydrogenation, to treat with hydrogen, also a form of chemical reduction, is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of acatalyst. The process is commonly employed to reduce or saturate organic compounds.

* Hydration Reaction: In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group(OH−) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon-carbon double bond which makes up an alkene functional group. The reaction usually runsin a strong acidic, aqueous solution. Hydration differs from hydrolysis in that hydrolysis cleaves the non-water component in two. Hydration leaves the non-water component intact.

Introduction:* In this report I will present the following terms: substitution, addition, hydrogenation, and hydration reaction.
* I will also present some examples about the terms.

Conclusions:
* Iunderstood that a substitution reaction is when a functional group in a particular chemical compound is replaced by another group
* Also that hydrogenation is a process is commonly employed to...