C$_2$H$_5$OH   +  CH$_3$COOH  ⇌  CH$_3$COOC$_2$H$_5$  +  H$_2$O The reaction above is

1. Analyze the question

The question asks you to identify the specific type of chemical reaction occurring between ethanol ($C_2H_5OH$) and ethanoic acid ($CH_3COOH$) to produce ethyl ethanoate ($CH_3COOC_2H_5$) and water ($H_2O$).

2. Explain the concept

This reaction is a classic example of a reaction between an alcohol and a carboxylic acid.

• The Principle: When an alcohol reacts with a carboxylic acid in the presence of a strong acid catalyst (usually concentrated $H_2SO_4$), it forms an ester and water. This process is known as esterification.
• The Equation: $R-OH + R'-COOH \rightleftharpoons R'-COOR + H_2O$ In this specific case: • $C_2H_5OH$ (Ethanol) + $CH_3COOH$ (Ethanoic acid) $\rightleftharpoons$ $CH_3COOC_2H_5$ (Ethyl ethanoate) + $H_2O$ (Water).

3. Show the solution

• Step 1: Identify the reactants. We have an alcohol ($C_2H_5OH$) and an organic acid ($CH_3COOH$).
• Step 2: Identify the products. The product $CH_3COOC_2H_5$ is an ester (specifically ethyl ethanoate), and water is produced as a byproduct.
• Step 3: Match the reaction type. Since the reaction produces an ester from an alcohol and an acid, it is defined as esterification.

4. Identify the answer

• A (Condensation): While esterification is a type of condensation reaction (because a small molecule like water is removed), "esterification" is the more specific and accurate term for this reaction in chemistry.
• B (Fermentation): This is the process of breaking down sugars into alcohol and $CO_2$ using enzymes.
• C (Esterification): This is the correct term for the formation of an ester from an alcohol and an acid.
• D (Hydrolysis): This is the reverse of esterification (breaking an ester down using water).

5. Tip

Memory Trick: Think of the name "Ester-ification" as "making an Ester." Whenever you see an alcohol and a carboxylic acid on the left side of the arrow, look for the ester functional group ($-COOC-$) on the right side. If you see it, the answer is almost certainly esterification!