Product when 2-halobutane is heated with aqueous NaOH or KOH

The same question, asked 2 times: 25 Apr 2025 S2*, 17 Apr 2026 S2. Every wording below, oldest first.

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Question 1
25 Apr 2025 S2
52 $Identify the product formed when 2-Bromobutane is heated with aqueous solution of sodium hydroxide.$
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Question 2
17 Apr 2026 S2
36 $Identify the product obtained when 2-chlorobutane is heated with aqueous solution of potassium hydroxide.$
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