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Exceptions to the octet rule: incomplete octet, expanded octet, odd-electron molecules

This type of question, asked 4 times: 11 May 2023 S1, 15 May 2023 S2, 9 May 2024 S2, 11 May 2024 S1. All 4 questions below, oldest first.

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  1. Question 1

    11 May 2023 S1

    68
    Which of the following compounds follows octet rule?

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  2. Question 2

    15 May 2023 S2

    81
    Which among the following is an example of odd electron molecule?

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  3. Question 3

    9 May 2024 S2

    74
    What is the number of electrons around sulfur in H2SO4\text{H}_2\text{SO}_4 molecule?

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  4. Question 4

    11 May 2024 S1

    95
    Identify a molecule with incomplete octet from following.

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