Question

Which of the following statements regarding ethers is NOT true?

• A. Aryl alkyl ethers have weaker and longer bonds between oxygen and aromatic ring.
• B. The alkoxy group in aryl alkyl ethers exhibits \(+R\) effect.
• C. When ethers are exposed to the atmosphere, they form corresponding peroxides.
• D. Ethers dissolve in cold, concentrated \(\text{H}_{2}\text{SO}_{4}\)

Hint:

In aryl alkyl ethers the aryl C-O bond has partial double bond character.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Check each statement about ethers for correctness.

Step 2: Aryl alkyl ethers
The oxygen lone pair is delocalised into the ring (\(+R\) effect), giving the \(\text{C}_{\text{aryl}}-\text{O}\) bond partial double bond character. So that bond is stronger and shorter, not weaker and longer.

Step 3: Other statements
The alkoxy group shows \(+R\) effect: true.
Ethers form explosive peroxides on exposure to air: true.
Ethers dissolve in cold conc. \(\text{H}_{2}\text{SO}_{4}\) by forming oxonium salts: true.

Final Answer:
The statement about weaker and longer bonds is not true. \[ \boxed{\text{(A) }\text{Aryl alkyl ethers have weaker and longer bonds between oxygen and aromatic ring.}} \]