Which nitrochlorobenzene has the most difficulty breaking its C-Cl bond (o-, m-, p-nitro, 2,4,6-trinitro)

The same question, asked 2 times: 3 May 2023 S1, 12 May 2024 S2. Every wording below, oldest first.

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Question 1
3 May 2023 S1
77 $Which of the following compounds has difficulty in breaking the C-Cl bond?$
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Question 2
12 May 2024 S2
60 $Which of the following compounds has difficulty in breaking of C-X bond during nucleophilic substitution reaction?$
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