Heteroatom and structure of common heterocycles (furan, thiophene, pyrrole, pyridine, pyran)

This type of question, asked 6 times: 11 May 2023 S2, 15 May 2023 S2, 16 May 2023 S2, 14 May 2024 S1, 25 Apr 2025 S2, 18 Apr 2026 S2. All 6 questions below, oldest first.

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Question 1
11 May 2023 S2
70 $Identify the correct pair of molecule and the heteroatom present in it respectively from following:$
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Question 2
15 May 2023 S2
98 $Which of the following compounds contains S atom in its ring?$
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Question 3
16 May 2023 S2
69 $Which from following compounds contains oxygen as a heteroatom?$
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Question 4
14 May 2024 S1
72 $Which from following molecules does NOT contain nitrogen in it?$
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Question 5
25 Apr 2025 S2
60 $Which from following compounds does NOT contain nitrogen in it?$
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Question 6
18 Apr 2026 S2
16 $Which from following compounds does NOT contain double bond in it ?$
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Heteroatom and structure of common heterocycles (furan, thiophene, pyrrole, pyridine, pyran)

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Question 6