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Identify the series from a formula

This type of question, asked 3 times: 2024, 2025, 2026. All 5 questions below, oldest first.

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  1. Question 1

    2024

    4
    The name and formula of third member of homologous series of alkyne is :

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  2. Question 2

    2024

    6
    Identify a group of the unsaturated hydrocarbons from the following :

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  3. Question 3

    2025

    4
    Select from the following a hydrocarbon having one C−C\mathrm{C{-}C} bond and one C≡C\mathrm{C{\equiv}C} bond :

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  4. Question 4

    2026

    18
    Which of the following set of compounds does not belong to same homologous series ?

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  5. Question 5

    2026

    20
    The hydrocarbons with general formula CnH2n\mathrm{C_nH_{2n}} represents :

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