Consider the following reactions :
`X+HCloversetunderset(AlCl_(3))("Anhydrous")rarrC_(2)H_(5)Cloversetunderset(KOH)("Aqueous")rarrY` Y can be converted to X on heating with ……….. At ………….. Temperature.

Options

A. `Al_(2)O_(3),350^(@)C`
B. `Cu,300^(@)C`
C. `Ca(OH)_(2)+CaOCl_(2),60^(@)C`
D. `NaOH//I_(2),60^(@)C`

Answer

To solve the problem, we need to analyze the reactions step by step:

### Step 1: Identify the reactants and products
- The starting compound \( X \) is likely to be ethylene, which is \( C_2H_4 \).
- The reaction with \( HCl \) in the presence of anhydrous \( AlCl_3 \) leads to the formation of \( C_2H_5Cl \) (ethyl chloride).

### Step 2: Understand the reaction with aqueous KOH
- The compound \( C_2H_5Cl \) (ethyl chloride) reacts with aqueous \( KOH \) to form \( C_2H_5OH \) (ethyl alcohol). This is a nucleophilic substitution reaction where the chloride ion is replaced by a hydroxyl group.

### Step 3: Identify the conversion of Y back to X
- \( Y \) is \( C_2H_5OH \) (ethyl alcohol), and we need to convert it back to \( X \) (ethylene, \( C_2H_4 \)).
- To convert alcohol to alkene, we typically use dehydration.

### Step 4: Determine the reagent and conditions for dehydration
- The dehydration of alcohols can be achieved using \( Al_2O_3 \) (alumina) as a catalyst.
- The reaction is performed at a high temperature, typically around \( 350^\circ C \).

### Final Answer
Thus, \( Y \) can be converted to \( X \) on heating with **\( Al_2O_3 \)** at **\( 350^\circ C \)**.