What is IUPAC name of following compound?

What is IUPAC name of following compound?

1. 1-Methoxy-3,3-dimethýlcyclobutane
2. 3-Methoxy-1,1-dimethylcyclobutane
3. 3, 3-dimethylcyclobutoxymethane
4. 1-Methoxy-3-isopropylbutane

Asked in: MHT CET 2024 (16 May Shift 1)

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