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Which of the following will give a positive 2,4-DNP test? me H3C H O A O all of them O D OC A A and B A, B, and C B B and C CH3 Darbart H3C B CH3 H3C H3C D 0-4

Which of the following will give a positive 2,4-DNP test? me H3C H O A O all of them O D OC A A and B A, B, and C B B and C CH3 Darbart H3C B CH3 H3C H3C D 0-4

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question:** Which of the following will give a positive 2,4-DNP test? **Options:** - **A:** A molecular structure featuring an aldehyde group with a carbon chain: CH₃CH₂CHO - **B:** A molecular structure featuring a ketone group with a methyl group: CH₃COCH₂CH₃ - **C:** A molecular structure featuring an ester group: CH₃COOCH₃ - **D:** A molecular structure featuring an aldehyde group with a carbon chain: CH₃CH₂COOH **Answer Choices:** - A - all of them - D - A and B - C - A, B, and C - B - B and C **Explanation:** The 2,4-DNP test is used to identify aldehydes and ketones. 2,4-Dinitrophenylhydrazine (2,4-DNP) reacts with carbonyl groups present in aldehydes and ketones, forming a yellow, orange, or red precipitate called a dinitrophenylhydrazone. This test does not give a positive result for carboxylic acids or esters.
Transcribed Image Text:**Question:** Which of the following will give a positive 2,4-DNP test? **Options:** - **A:** A molecular structure featuring an aldehyde group with a carbon chain: CH₃CH₂CHO - **B:** A molecular structure featuring a ketone group with a methyl group: CH₃COCH₂CH₃ - **C:** A molecular structure featuring an ester group: CH₃COOCH₃ - **D:** A molecular structure featuring an aldehyde group with a carbon chain: CH₃CH₂COOH **Answer Choices:** - A - all of them - D - A and B - C - A, B, and C - B - B and C **Explanation:** The 2,4-DNP test is used to identify aldehydes and ketones. 2,4-Dinitrophenylhydrazine (2,4-DNP) reacts with carbonyl groups present in aldehydes and ketones, forming a yellow, orange, or red precipitate called a dinitrophenylhydrazone. This test does not give a positive result for carboxylic acids or esters.
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