Pick the chiral molecule: 2-halopropane, 2-halo-2-methylbutane, 2-halo-3-methylbutane, 3-halopentane

The same question, asked 4 times: 4 May 2023 S1, 16 May 2023 S2*, 9 May 2024 S1*, 12 May 2024 S1. Every wording below, oldest first.

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Question 1
4 May 2023 S1
72 $Identify the chiral molecule from following.$
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Question 2
16 May 2023 S2
73 $Identify chiral molecule from following:$
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Question 3
9 May 2024 S1
74 $Identify the chiral molecule from following.$
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Question 4
12 May 2024 S1
62 $Identify the chiral molecule from the following.$
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