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Which compound will react with acidified potassium dichromate(VI) and with alkaline aqueous iodine? A CH₃COCH₃ B CH₃CH(OH)CH₃ C CH₃CH₂CH₂CHO D CH₃CH₂CH₂OH - CIE - A-Level Chemistry - Question 27 - 2017 - Paper 1

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Question 27

Which-compound-will-react-with-acidified-potassium-dichromate(VI)-and-with-alkaline-aqueous-iodine?--A--CH₃COCH₃--B--CH₃CH(OH)CH₃--C--CH₃CH₂CH₂CHO--D--CH₃CH₂CH₂OH-CIE-A-Level Chemistry-Question 27-2017-Paper 1.png

Which compound will react with acidified potassium dichromate(VI) and with alkaline aqueous iodine? A CH₃COCH₃ B CH₃CH(OH)CH₃ C CH₃CH₂CH₂CHO D CH₃CH₂CH₂OH

Worked Solution & Example Answer:Which compound will react with acidified potassium dichromate(VI) and with alkaline aqueous iodine? A CH₃COCH₃ B CH₃CH(OH)CH₃ C CH₃CH₂CH₂CHO D CH₃CH₂CH₂OH - CIE - A-Level Chemistry - Question 27 - 2017 - Paper 1

Step 1

A) CH₃COCH₃

96%

114 rated

Answer

This compound is a ketone (acetone) and does not react with acidified potassium dichromate(VI), nor with alkaline aqueous iodine.

Step 2

B) CH₃CH(OH)CH₃

99%

104 rated

Answer

This compound is a secondary alcohol, which can be oxidized by acidified potassium dichromate(VI) to a ketone and can also react with alkaline aqueous iodine. Therefore, this is the correct answer.

Step 3

C) CH₃CH₂CH₂CHO

96%

101 rated

Answer

This compound is an aldehyde and will react with acidified potassium dichromate(VI) but will not react with alkaline aqueous iodine.

Step 4

D) CH₃CH₂CH₂OH

98%

120 rated

Answer

This compound is a primary alcohol and can react with acidified potassium dichromate(VI) but does not react with alkaline aqueous iodine.

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