Which pair of compounds are functional isomers (an alcohol and an ether)

The same question, asked 2 times: 23 Apr 2025 S1*, 13 May 2026 S2. Every wording below, oldest first.

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Question 1
23 Apr 2025 S1
92 $Which among the following is a pair of functional isomers?$
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Question 2
13 May 2026 S2
17 $Identify the correct pair of functional isomers.$
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