Explain the given reactions with the examples(a) Hydrogenation reaction(b) Oxidation reaction(c) Substitution reaction(d) Saponification reaction(e) Combustion reaction

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(a) Hydrogenation reaction can be defined as an addition reaction between the hydrogen and other compounds in the presence of a catalyst.
$CH_2 = CH_2 → CH_3CH_3$

(b) An oxidation reaction is a reaction in which oxygen combines with an element or a compound. In other words, it can also be defined as a molecule loses its electrons.
$2Mg + O_2→ 2MgO$

(c) Substitution reaction can be defined as the reaction in which a more reactive element displaces a less reactive element from its aqueous salt solution.
$Zn + CuSO_4 → ZnSO_4 + Cu$

(d) Saponification reaction is the reaction in which the hydrolysis of an ester takes place with NaOH or KOH to give alcohol and sodium or potassium salt of the acid.
$CH_3COOC_2H_5 + NaOH → C_2H_5OH + CH_3COONa$

(e) Combustion reaction is the reaction in which oxygen combines with a compound to form carbon dioxide and water. These reactions are exothermic, meaning they give off heat.
$CH_4 + 2O_2 → 2H_2O + CO_2$
Updated on 10-Oct-2022 13:29:14