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Partial hydrogenation of an alkyne with Lindlar's catalyst (Pd-C, quinoline) to a cis-alkene

This type of question, asked 3 times: 3 May 2023 S1, 26 Apr 2025 S1, 13 May 2026 S1. All 3 questions below, oldest first.

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  1. Question 1

    3 May 2023 S1

    94
    Which of the following catalysts is used to convert −C≡C−-\text{C}\equiv\text{C}- to form cis-alkene?

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  2. Question 2

    26 Apr 2025 S1

    52
    Which of the following reagents is used to convert C≡CC \equiv C triple bond to C=CC = C double bond to give Cis isomer of alkene?

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  3. Question 3

    13 May 2026 S1

    17
    Identify the product when but-2-yne is treated with H2\mathrm{H_2} gas in the presence of Lindlar's catalyst.

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