Highest boiling point among given alkanes (chain length and branching)

This type of question, asked 2 times: 3 May 2023 S2, 21 Apr 2025 S1. All 2 questions below, oldest first.

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Question 1
3 May 2023 S2
93 $Which from following has highest boiling point?$
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Question 2
21 Apr 2025 S1
83 $Which of the following compounds has highest boiling point?$
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