Study the reaction scheme below and answer the questions that follow - Leaving Cert Chemistry - Question 8 - 2018
Question 8
Study the reaction scheme below and answer the questions that follow.
(a) Name the compounds W, X and Y.
(b) Draw the structure of an ethanol molecule.
(c) In whi... show full transcript
Worked Solution & Example Answer:Study the reaction scheme below and answer the questions that follow - Leaving Cert Chemistry - Question 8 - 2018
Step 1
Name the compounds W, X and Y.
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Answer
W: ethene
X: ethanol
Y: ethanoic acid
Step 2
Draw the structure of an ethanol molecule.
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Answer
The structure of an ethanol molecule is as follows:
H H
| |
H-C-C-O-H
| |
H H
This represents ethanol (C2H5OH).
Step 3
In which one of the molecules, W, ethanol, X or Y, are all the carbon atoms in planar geometry?
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The molecule W (ethene) has all its carbon atoms in planar geometry due to the double bond between them, resulting in the sp2 hybridization of each carbon atom.
Step 4
Classify as an addition, as a substitution or as an oxidation reaction:
(i) the conversion of W to ethene.
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(i) The conversion of W (ethene) to the other form is an addition reaction.
Step 5
Classify as an addition, as a substitution or as an oxidation reaction:
(ii) the conversion of X to Y.
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(ii) The conversion of X (ethanol) to Y (ethanoic acid) is an oxidation reaction.
Step 6
Describe what is observed when Fehling's reagent.
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When Fehling's reagent reacts with the compound, a blue solution changes to a brick red (orange) precipitate, indicating the presence of reducing sugars.
Step 7
Give a common use for Y in the food industry.
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Answer
Y (ethanoic acid) is commonly used as a flavoring, preservative, or pickling agent in the food industry. It is also known as vinegar.
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