Product when tert-butyl bromide is heated with silver fluoride

The same question, asked 2 times: 16 May 2023 S2, 19 Apr 2025 S2. Every wording below, oldest first.

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Question 1
16 May 2023 S2
89 $What is the major product obtained when tert-butyl bromide is heated with silver fluoride?$
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Question 2
19 Apr 2025 S2
74 $When tart butyl bromide is heated with silver fluoride the major product obtained is$
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