`{:("Column-I","Column-II"),((A)C_2H_5-oversetoverset(O)(||)C-OH-overset(C_2H_5O^(Theta))to,(p)"Hydrolysis"),((B)C_2H_5-oversetoverset(O)(||)C-OH-overset(o+)overset(C_2H_5OH//H)to,(q)"Esterification"),((C )C_2H_5-oversetoverset(O)(||)C-OC_2H_5overset(H_3O^(o+))to,(r)"Saponification"),((D)C_2H_5-oversetoverset(O)(||)C-OC_2H_5overset(Theta)overset(OH)to,(s)"Acid base solution"),(,""):}`

Explanation

To solve the question, we need to match the reactions from Column I with their corresponding types from Column II. Let's analyze each reaction step by step.

### Step 1: Analyze Reaction A
- **Reaction A**: C2H5C(=O)OH + C2H5O^(-) → ?
- Here, we have an acid (C2H5C(=O)OH) reacting with an alkoxide ion (C2H5O^(-)).
- The product formed will be an anion (C2H5COO^(-)) and an alcohol (C2H5OH).
- This reaction can be classified as an **acid-base reaction** because it involves the transfer of a proton (H^+) from the acid to the alkoxide ion.

### Conclusion for Reaction A:
- **Match**: A → S (Acid-base solution)

### Step 2: Analyze Reaction B
- **Reaction B**: C2H5C(=O)OH + C2H5OH (in presence of H^+) → ?
- This is a classic esterification reaction where a carboxylic acid (C2H5C(=O)OH) reacts with an alcohol (C2H5OH) in the presence of an acid catalyst (H^+).
- The product formed will be an ester (C2H5C(=O)O-C2H5) and water.

### Conclusion for Reaction B:
- **Match**: B → Q (Esterification)

### Step 3: Analyze Reaction C
- **Reaction C**: C2H5C(=O)O-C2H5 + H3O^+ → ?
- This reaction involves the hydrolysis of an ester (C2H5C(=O)O-C2H5) in the presence of an acid (H3O^+).
- The products will be the corresponding carboxylic acid (C2H5C(=O)OH) and an alcohol (C2H5OH).
- This is a **hydrolysis reaction**.

### Conclusion for Reaction C:
- **Match**: C → P (Hydrolysis)

### Step 4: Analyze Reaction D
- **Reaction D**: C2H5C(=O)O-C2H5 + OH^(-) → ?
- In this case, the ester (C2H5C(=O)O-C2H5) is being hydrolyzed in the presence of a base (OH^(-)).
- This reaction is specifically known as **saponification**, where an ester reacts with a base to form a carboxylate ion and an alcohol.

### Conclusion for Reaction D:
- **Match**: D → R (Saponification)

### Final Matches:
- A → S (Acid-base solution)
- B → Q (Esterification)
- C → P (Hydrolysis)
- D → R (Saponification)

### Summary of Matches:
- A - S
- B - Q
- C - P
- D - R