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Name the second lower or higher homologue of a carboxylic acid

The same question, asked 2 times: 17 Apr 2026 S2*, 18 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    17 Apr 2026 S2

    15
    What is the name of second lower homologue of CH3(CH2)2COOH\mathrm{CH_3(CH_2)_2COOH} ?

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  2. Question 2

    18 Apr 2026 S1

    16
    Identify the name of second higher homologue of formic acid?

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