Highest or lowest boiling point in a homologous series of aldehydes or acids

This type of question, asked 4 times: 9 May 2024 S2, 20 Apr 2025 S2, 23 Apr 2025 S1, 26 Apr 2025 S1. All 4 questions below, oldest first.

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Question 1
9 May 2024 S2
99 $Which among the following has the lowest boiling point?$
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Question 2
20 Apr 2025 S2
92 $Which from following compounds has highest boiling point?$
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Question 3
23 Apr 2025 S1
93 $Which among the following compounds has highest boiling point?$
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Question 4
26 Apr 2025 S1
77 $Which among the following has highest boiling point?$
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Question 1