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Number of structural isomers of a given molecular formula

This type of question, asked 3 times: 2021 Paper 13, 4 Apr 2024, 3 Apr 2025. All 3 questions below, oldest first.

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  1. Question 1

    2021 Paper 13

    32
    Number of acyclic structural isomers for pentene are:

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  2. Question 2

    4 Apr 2024

    59
    The number of different chain isomers for C7H16C_{7}H_{16} is ___ .
  3. Question 3

    3 Apr 2025

    125
    The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula C9H12C_{9}H_{12} is ____ .