Complete the following reactions:
(i) `C_(2)H_(5)I+H_(2) underset(C_(2)H_(5)OH)overset(Zn-Cu)toK`
(ii) `CH_(30COONa+H_(2)O overset("Electrolysis")toY`
(iii) `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3) underset(773K)overset(Cr_(2)O_(3)//Al_(2)O_(3))toZ`

Options

A. `X=C_(2)H_(6),Y=C_(2)H_(6),Z=C_(6)H_(6)`
B. `X=CH_(4),Y=CH_(30COOH,Z=CH_(3)CH_(3)`
C. `X=C_(2)H_(6),Y=CH_(4),Z=C_(4)H_(10)`
D. `X=C_(2)H_(6),Y=CH_(4),Z=C_(5)H_(10)`

Answer

Let's solve the reactions step by step.

### Reaction (i):
**Given Reaction:**
\[ C_2H_5I + H_2 \xrightarrow{Zn-Cu} X \]

**Step 1:** Identify the reactants.
- The reactant is iodoethane (\(C_2H_5I\)) and hydrogen gas (\(H_2\)).

**Step 2:** Determine the type of reaction.
- This is a reduction reaction where the iodine atom in iodoethane will be replaced by hydrogen.

**Step 3:** Write the balanced equation.
- The reaction will eliminate hydrogen iodide (HI) and form ethane (\(C_2H_6\)).

**Final Product:**
\[ X = C_2H_6 \] (Ethane)

### Reaction (ii):
**Given Reaction:**
\[ CH_3COONa + H_2O \xrightarrow{\text{Electrolysis}} Y \]

**Step 1:** Identify the reactants.
- The reactant is sodium acetate (\(CH_3COONa\)) and water (\(H_2O\)).

**Step 2:** Determine the type of reaction.
- This is an electrolysis reaction, which will lead to decarboxylation.

**Step 3:** Write the balanced equation.
- During electrolysis, sodium acetate will lose a carbon dioxide molecule (CO2) and form ethane (\(C_2H_6\)).

**Final Product:**
\[ Y = C_2H_6 \] (Ethane)

### Reaction (iii):
**Given Reaction:**
\[ CH_3CH_2CH_2CH_2CH_2CH_3 \xrightarrow{773K, Cr_2O_3//Al_2O_3} Z \]

**Step 1:** Identify the reactants.
- The reactant is n-hexane (\(C_6H_{14}\)).

**Step 2:** Determine the type of reaction.
- This is a dehydrogenation reaction that occurs at high temperatures, leading to cyclization and aromatization.

**Step 3:** Write the balanced equation.
- The n-hexane will undergo dehydrogenation and cyclization to form benzene (\(C_6H_6\)).

**Final Product:**
\[ Z = C_6H_6 \] (Benzene)

### Summary of Products:
- \( X = C_2H_6 \) (Ethane)
- \( Y = C_2H_6 \) (Ethane)
- \( Z = C_6H_6 \) (Benzene)

---