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Maleic acid is used in the food industry and for stabilising drugs - CIE - A-Level Chemistry - Question 22 - 2018 - Paper 1

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Maleic acid is used in the food industry and for stabilising drugs. It is the cis-isomer of butenedioic acid and has the structural formula HO2CCH=CHCO2H. What is t... show full transcript

Worked Solution & Example Answer:Maleic acid is used in the food industry and for stabilising drugs - CIE - A-Level Chemistry - Question 22 - 2018 - Paper 1

Step 1

Identify the Reaction Type

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Answer

The reaction involves maleic acid, which is a dicarboxylic acid, and cold, dilute, acidified manganate(VII) ions. This type of reaction typically results in oxidation. Manganate ions at low temperatures act as mild oxidizing agents.

Step 2

Determine the Structure of Maleic Acid

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Maleic acid has the structural formula HO2CCH=CHCO2H, which features a double bond between the two carbon atoms in the center. This is significant since the double bond is likely to undergo oxidation during the reaction.

Step 3

Predict the Product

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When maleic acid is treated with manganate(VII) ions, the double bond between the carbons will be oxidized to form a compound that includes an additional oxygen atom. The expected product is a diol, specifically HO2CCH(OH)CH(OH)CO2H, after the oxidation of the double bond.

Step 4

Select the Correct Answer

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Answer

Among the answer choices provided, the correct product that fits this reaction is option A: HO2CCH(OH)CH(OH)CO2H.

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