Three reagents are added separately to four organic compounds. Which row shows the correct observations? Sodium hydrogen carbonate Acidified potassium dichromate(VI) Tollens' reagent A Propan-1-ol effervescence orange solution turns green no visible change B Propanal no visible change orange solution turns green silver mirror C Propanone no visible change no visible change silver mirror D Propanoic acid effervescence no visible change no visible change

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Three reagents are added separately to four organic compounds - AQA - A-Level Chemistry - Question 23 - 2019 - Paper 3

Question 23

Three reagents are added separately to four organic compounds. Which row shows the correct observations? Sodium hydrogen carbonate Acidified potassium dichromate(V... show full transcript

Worked Solution & Example Answer:Three reagents are added separately to four organic compounds - AQA - A-Level Chemistry - Question 23 - 2019 - Paper 3

Step 1

Sodium hydrogen carbonate - Effervescence

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Answer

Effervescence is observed when sodium hydrogen carbonate reacts with carboxylic acids. Therefore, both Propan-1-ol and Propanoic acid will show effervescence.

Step 2

Acidified potassium dichromate(VI) - Orange solution turns green

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Answer

Only aldehydes are oxidized by acidified potassium dichromate(VI). Propanal will turn the solution green as it is an aldehyde while propanone, being a ketone, will not change the color.

Step 3

Tollens' reagent - Silver mirror

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Answer

The Tollens' reagent will give a silver mirror only with aldehydes. Propanal will produce a silver mirror while propanone will not.

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Questions answered

Three reagents are added separately to four organic compounds - AQA - A-Level Chemistry - Question 23 - 2019 - Paper 3

Worked Solution & Example Answer:Three reagents are added separately to four organic compounds - AQA - A-Level Chemistry - Question 23 - 2019 - Paper 3

Sodium hydrogen carbonate - Effervescence

Acidified potassium dichromate(VI) - Orange solution turns green

Tollens' reagent - Silver mirror

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