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Malic acid is found in apples - CIE - A-Level Chemistry - Question 26 - 2016 - Paper 1

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Question 26

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Malic acid is found in apples. Which reagent will react with all three –OH groups present in the malic acid molecule? A ethanol in the presence of concentrated sulf... show full transcript

Worked Solution & Example Answer:Malic acid is found in apples - CIE - A-Level Chemistry - Question 26 - 2016 - Paper 1

Step 1

A. ethanol in the presence of concentrated sulfuric acid

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Answer

Ethanol in concentrated sulfuric acid primarily facilitates esterification but does not react with all –OH groups.

Step 2

B. potassium hydroxide

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Answer

Potassium hydroxide is a strong base that can deprotonate –OH groups, but it does not react with them in the expected manner to form derivatives.

Step 3

C. sodium

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Answer

Sodium reacts vigorously with alcohols, including all the –OH groups present in malic acid, producing sodium alkoxide and hydrogen gas.

Step 4

D. sodium carbonate

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Answer

Sodium carbonate does not react effectively with alcohols and would not react with the –OH groups.

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