Study the reaction scheme below and answer the questions that follow:
(a) Give the IUPAC name for W and draw its molecular structure - Leaving Cert Chemistry - Question 8 - 2015
Question 8
Study the reaction scheme below and answer the questions that follow:
(a) Give the IUPAC name for W and draw its molecular structure.
(b) The diagram shows the pre... show full transcript
Worked Solution & Example Answer:Study the reaction scheme below and answer the questions that follow:
(a) Give the IUPAC name for W and draw its molecular structure - Leaving Cert Chemistry - Question 8 - 2015
Step 1
Give the IUPAC name for W and draw its molecular structure.
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Answer
The IUPAC name for W is ethene. Below is its molecular structure:
H H
\ /
C=C
/ \
H H
Step 2
Give the name or formula for compound C.
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Answer
Compound C is aluminium oxide or given in formula form as Al₂O₃.
Step 3
Classify the reaction type as an addition, an oxidation or an elimination.
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Answer
The reaction type can be classified as an elimination reaction.
Step 4
Explain what is meant by describing W as unsaturated.
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Answer
Describing W as unsaturated means that W contains at least one double bond or triple bond between carbon atoms, which indicates that it has fewer hydrogen atoms than the corresponding saturated hydrocarbon.
Step 5
Describe how you would test to confirm that W is unsaturated.
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Answer
To test for unsaturation, you can add bromine solution (or acidified permanganate (KMnO₄) solution). If the solution changes from brown to a colourless state, it indicates a positive test for unsaturation as W reacts with bromine, showing it has double bonds.
Step 6
Name compound X.
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Answer
Compound X is known as ethanal.
Step 7
What type of reaction is the conversion of ethanol to X: an addition, an oxidation or a substitution reaction?
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Answer
The conversion of ethanol to X is classified as an oxidation reaction.
Step 8
Which one of the two compounds, W or ethanol, would you expect to be more soluble in water? Why?
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Answer
Ethanol is expected to be more soluble in water because it is polar and can form hydrogen bonds with water molecules, whereas W (ethene) is non-polar and cannot engage in such interactions.
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