A neutral organic compound A of molecular formula `C_(2)H_(6)O`, on oxidation with potassium dichromate and sulphuric acid gives an acidic compound B. The compound A reacts with B on warming in presence of conc. `H_(2)SO_(4)` to give a sweet smelling substance C. C on heating with D gives back A.
Compound C in the above reaction is

Options

A. an alcohol
B. an ester
C. a hydrocarbon
D. hydrogen

Explanation

To solve the problem step by step, we need to analyze the information given in the question and the relationships between the compounds A, B, and C.

### Step 1: Identify Compound A
- The molecular formula of compound A is \( C_2H_6O \). This formula suggests that compound A could be either an alcohol or an ether.
- Given that it can be oxidized to form an acidic compound B, we can conclude that compound A is likely an alcohol.
- The most likely candidate for \( C_2H_6O \) that fits this description is ethanol (\( CH_3CH_2OH \)).

**Hint:** Look for functional groups in the molecular formula to determine the type of compound.

### Step 2: Oxidation of Compound A
- When ethanol (A) is oxidized with potassium dichromate and sulfuric acid, it forms acetic acid (B), which is \( CH_3COOH \).
- This confirms that compound B is acetic acid.

**Hint:** Remember that primary alcohols oxidize to aldehydes and then to carboxylic acids.

### Step 3: Reaction of A with B
- The reaction of ethanol (A) with acetic acid (B) in the presence of concentrated sulfuric acid leads to the formation of an ester, which is a sweet-smelling compound (C).
- The reaction can be represented as:
\[ CH_3CH_2OH + CH_3COOH \xrightarrow{H_2SO_4} CH_3COOCH_2CH_3 + H_2O \]
- The compound formed (C) is ethyl acetate (\( CH_3COOCH_2CH_3 \)).

**Hint:** Esters are often sweet-smelling compounds formed from the reaction of an alcohol and a carboxylic acid.

### Step 4: Heating Compound C with D
- The question states that heating compound C with D gives back A.
- When ethyl acetate (C) is heated with water (D) in a hydrolysis reaction, it can regenerate ethanol (A) and acetic acid (B).
- This confirms that compound D is likely water.

**Hint:** Hydrolysis reactions can regenerate the original reactants from esters.

### Final Conclusion
- The sweet-smelling substance C formed in the reaction is ethyl acetate.

**Final Answer:** Compound C is ethyl acetate (\( CH_3COOCH_2CH_3 \)).