(A) `A(C_(7)H_(14)) overset(O_(3)//Red)(rarr)B(C_(3)H_(6)O)+C`
(B) Gives positive Tollens test but negative iodform test.
(C ) Give negative Tollens test but positive iodoform test.
The compound (B) can be converted to (C ) by using the reagents:

Options

A. a.i. `EtMgBr//H_(3)O^(o+)`, ii. `Acidic KMnO_(4)`
B. b.i. `MeMgBr//H_(3)O^(o+)`, ii. `Acidic KMnO_(4)`
C. c.i. `EtMgBr//H_(3)O^(o+)`, ii. `Aqueous KMnO_(4)`
D. d.i. `MeMgBr//H_(3)O^(o+)`, ii. `Aqueous KMnO_(4)`

Explanation

To solve the question step by step, we will analyze the information provided and identify the compounds involved in the reactions.

### Step 1: Identify Compound A
- Given that compound A has the formula \( C_7H_{14} \), it is an alkene. The structure of heptene (the alkene with 7 carbon atoms) can be represented as:
\[ \text{Heptene: } CH_3-CH_2-CH_2-CH_2-CH=CH-CH_3 \]

### Step 2: Ozonolysis of Compound A
- When heptene undergoes ozonolysis (reaction with ozone), it will break down into two products: an aldehyde (compound B) and a ketone (compound C).
- The ozonolysis of heptene will yield:
\[ \text{Aldehyde (B): } CH_3CH_2CHO \quad (\text{propanal}) \]
\[ \text{Ketone (C): } CH_3COCH_2CH_3 \quad (\text{butanone}) \]

### Step 3: Analyze the Tests for Compounds B and C
- **Compound B (propanal)** gives a positive Tollens test (indicating the presence of an aldehyde) and a negative iodoform test (since propanal does not have a methyl ketone structure).
- **Compound C (butanone)** gives a negative Tollens test (as it is a ketone) but a positive iodoform test (since butanone has a methyl group adjacent to the carbonyl).

### Step 4: Converting Compound B to Compound C
- To convert compound B (propanal) to compound C (butanone), we can use the following reagents:
1. **Methyl magnesium bromide (Grignard reagent)**: This will react with propanal to form 2-butanol.
2. **Acidic KMnO4**: This will oxidize 2-butanol to butanone.

### Step 5: Write the Reactions
1. **Formation of 2-butanol from propanal**:
\[ CH_3CH_2CHO + CH_3MgBr \xrightarrow{H_3O^+} CH_3CH(OH)CH_2CH_3 \quad (\text{2-butanol}) \]
2. **Oxidation of 2-butanol to butanone**:
\[ CH_3CH(OH)CH_2CH_3 \xrightarrow{KMnO_4} CH_3COCH_2CH_3 \quad (\text{butanone}) \]

### Final Answer
- The reagents needed to convert compound B to compound C are:
- **Methyl magnesium bromide (Grignard reagent) followed by acidic KMnO4**.