Which pairs of alcohols and ethers are isomers or metamers

This type of question, asked 2 times: 4 May 2023 S1, 4 May 2023 S2. All 2 questions below, oldest first.

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Question 1
4 May 2023 S1
60 $Which from following pairs of compounds exhibits metamerism?$
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Question 2
4 May 2023 S2
89 $Which among the following is NOT a pair of isomers?$
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