Substitution products in electrophilic aromatic substitution are the result of the replacement of a hydrogen atom on an aromatic ring with an electrophile. This process occurs when an electrophile attacks the aromatic ring and forms a new bond, leading to the substitution of the hydrogen atom. The resulting substitution products can be ortho, meta, or para depending on the position of the electrophile relative to the other substituents on the aromatic ring. These substitution products are important in organic chemistry as they can significantly alter the reactivity and properties of the aromatic compound. **

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Substitution is a mathematical technique used to simplify or solve equations by replacing a variable with a specific value. For example, if we have the equation 2x + 3 = 7 and we want to solve for x, we can use substitution by replacing x with the value that satisfies the equation, in this case x = 2. This allows us to simplify the equation and solve for the unknown variable. Substitution is a powerful tool in algebra and can be used to simplify complex equations and expressions. **

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A radical substitution is a type of chemical reaction in which a radical replaces another atom or group of atoms in a molecule. This process involves the formation of highly reactive species called radicals, which have unpaired electrons. Radicals are typically generated by the homolytic cleavage of a covalent bond. Radical substitutions are commonly seen in organic chemistry reactions, such as in the halogenation of alkanes. **

A nucleophilic substitution is a type of organic reaction where a nucleophile replaces a leaving group in a molecule. The nucleophile is an electron-rich species that attacks the electrophilic carbon atom, leading to the displacement of the leaving group. This reaction is commonly seen in alkyl halides, where the halogen atom is replaced by a nucleophile such as hydroxide or amine. Nucleophilic substitutions can proceed via either an SN1 (unimolecular) or SN2 (bimolecular) mechanism, depending on the structure of the substrate and reaction conditions. **

Substitution in mathematics is the process of replacing a variable in an expression with a specific value or another expression. This is done to simplify the expression or to evaluate it for a particular set of values. Substitution is commonly used in algebra to solve equations or simplify complex expressions by replacing variables with known values. It allows us to manipulate and work with mathematical expressions more easily. **