Which is incorrect in regard to the formation of ester-

Options

A. It can be obtained by heating silver acetate and ethyl bromide
B. It can be obtained by the action of ethyl alcohol on `CH_(3)COCl` or acetic anhydride
C. It can be obtained by heating `CH_(3)CHO` in presence of aluminium ethoxide
D. None of these

Answer

To determine which statement is incorrect regarding the formation of esters, we will analyze each option step by step.

### Step 1: Analyze the First Option
**Statement:** "It can be obtained by heating ethyl bromide with silver acetate."

- **Reaction:**
- Ethyl bromide (C2H5Br) reacts with silver acetate (AgOAc).
- The reaction can be represented as:
\[ C_2H_5Br + AgOAc \rightarrow C_2H_5OCOCH_3 + AgBr \]
- **Product:** The product formed is ethyl acetate (ethyl ethanoate) and silver bromide (AgBr) is a byproduct.
- **Conclusion:** This statement is correct.

### Step 2: Analyze the Second Option
**Statement:** "It can be obtained by the action of ethyl alcohol on acetyl chloride."

- **Reaction:**
- Ethyl alcohol (C2H5OH) reacts with acetyl chloride (CH3COCl).
- The reaction can be represented as:
\[ C_2H_5OH + CH_3COCl \rightarrow C_2H_5OCOCH_3 + HCl \]
- **Product:** The product formed is ethyl acetate (ethyl ethanoate) and hydrochloric acid (HCl) is a byproduct.
- **Conclusion:** This statement is also correct.

### Step 3: Analyze the Third Option
**Statement:** "It can be obtained by heating acetaldehyde in the presence of aluminum ethoxide."

- **Reaction:**
- Acetaldehyde (CH3CHO) reacts in the presence of aluminum ethoxide (Al(OEt)3).
- This reaction is known as the Tishchenko reaction.
- The reaction can be represented as:
\[ 2 CH_3CHO \xrightarrow{Al(OEt)_3} CH_3COOCH_2CH_3 \]
- **Product:** The product formed is an ester (ethyl acetate).
- **Conclusion:** This statement is correct as well.

### Step 4: Analyze the Fourth Option
**Statement:** "None of these."

- Since all three previous options are correct regarding the formation of esters, this statement is incorrect.
- **Conclusion:** This statement is incorrect.

### Final Answer
The incorrect statement regarding the formation of esters is the fourth option: "None of these."

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