Question

Identify the temperature required for preparation of ethoxyethane from ethanol in the presence of \(\text{H}_{2}\text{SO}_{4}\).

• A. \(113K\)
• B. \(443K\)
• C. \(413K\)
• D. \(213K\)

Hint:

Excess ethanol with conc. H2SO4 at 413 K gives ether, while 443 K gives ethene.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Ethanol with concentrated \(\text{H}_{2}\text{SO}_{4}\) gives different products at different temperatures.

Step 2: Temperature Effect
At \(443\ \text{K}\) the product is ethene (intramolecular dehydration).
At \(413\ \text{K}\) with excess alcohol, the product is ethoxyethane (intermolecular dehydration).

Step 3: Equation
\(2\text{C}_{2}\text{H}_{5}\text{OH}\xrightarrow{\text{H}_{2}\text{SO}_{4},\ 413\ \text{K}}\text{C}_{2}\text{H}_{5}\text{OC}_{2}\text{H}_{5}+\text{H}_{2}\text{O}\).

Final Answer:
The temperature is 413 K, option (C). \[ \boxed{\text{(C) }413K} \]