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Identify the alkane that has a given number of structural isomers (its formula, or moles of C in n mol)

The same question, asked 4 times: 2 May 2023 S1*, 10 May 2024 S2*, 12 May 2024 S2*, 13 May 2024 S2. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S1

    87
    What is the number of moles of carbon atoms present in nn mole molecules of an alkane if it exhibits five structural isomers?

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  2. Question 2

    10 May 2024 S2

    97
    Identify the molecular formula of an alkane that exhibits only two different structural isomers.

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  3. Question 3

    12 May 2024 S2

    66
    What is the number of moles of 'C' atoms present in n mole molecule of alkane if it exhibits three structural isomers?

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  4. Question 4

    13 May 2024 S2

    93
    What is molecular formula of an alkane if it exhibits three structural isomers?

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