Question

Identify the type of reaction when ethanol is burnt in air to form carbon dioxide, water and releases heat.
A) Redox reaction.
B) Combustion reaction.
C) Esterification reaction.
D) Synthesis reaction.

Answer 1

Hint: We know that redox reaction is often defined as a reaction during which electrons are transferred between two reactants participating in it. This transfer of electrons is often identified by observing the changes within the oxidation states of the reacting species.

Complete step by step solution:
Let us know about combustion reaction:
A combustion response is a response where a substance responds with oxygen gas, delivering energy as light and warmth. Combustion responses must include oxygen as one reactant.
Ethanol consumed within the sight of oxygen to frame carbon dioxide and water alongside the advancement of heat. This is a combustion response and the condition can be composed as,
$$C_2{H}_{5}OH\left(l\right)+3O_2\left(g\right)\to 2C{O}_2\left(g\right)+3H_{2}O\left(l\right)+heat$$
Thus it is a combustion reaction. Hence option B is correct.
We know that all the redox reactions have two parts, they are reduced half and an oxidized half which occur at the same time. The reduced half of the reaction accepts electrons and the oxidation number of the species gets decreased, while the oxidized half of the reaction loses electrons and the oxidation number of the species increases. There is no net variation in the number of electrons in a redox reaction.
In the above reaction the oxidation number of oxygen and carbon on both sides changes. Hence it is a redox reaction. Thus option A is correct.
We have to remember that an esterification is the way toward joining an acid with an alcohol to shape an ester and water; or a substance response bringing about the development of in any event one ester item. Ester is gotten by an esterification response of an alcohol and a carboxylic acid. Hence option C is incorrect.
We have to remember that the synthesis reaction is a direct combination response and is one of the most widely recognized kinds of substance response. In this reaction, at least two compound species join to shape a more unpredictable item. Hence option D is incorrect.
And hence option A and B is correct.

Note:As we know that in the oxidation process the electrons are lost from an atom. A compound that gains electrons during oxidation is known as oxidizing agent.
We have to remember that the reduction is the gain of electrons by an atom and a compound that loses electrons during reduction is called a reducing agent.