Consider the compounds A to E in the table on the right and answer the questions below - Leaving Cert Chemistry - Question 6 - 2015
Question 6
Consider the compounds A to E in the table on the right and answer the questions below.
(a) Why can all of these compounds be described as hydrocarbons?
(b) Give ... show full transcript
Worked Solution & Example Answer:Consider the compounds A to E in the table on the right and answer the questions below - Leaving Cert Chemistry - Question 6 - 2015
Step 1
Why can all of these compounds be described as hydrocarbons?
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Answer
All of these compounds can be described as hydrocarbons because they consist solely of carbon and hydrogen atoms, without any other elements present.
Step 2
Give the IUPAC names for any three of these compounds.
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Answer
The IUPAC names for three of the compounds are:
A: Methane
B: Ethene
C: Propene
Step 3
Which of the five compounds
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Answer
(i) is used in oxyacetylene cutting and welding of metals: A (Methane)
(ii) is the main component of natural gas: C (Methane)
(iii) is an alkene: B (Ethene)
(iv) is a component of LPG (liquefied petroleum gas): D (Propane)
Step 4
Each of these compounds burns in excess oxygen to produce the same two products.
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Answer
The two products produced when these compounds burn in excess oxygen are water (H₂O) and carbon dioxide (CO₂).
Step 5
Compound E is aromatic. Explain aromatic in terms of chemical structure.
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Answer
Aromatic compounds contain a benzene ring or similar cyclic structure, which exhibits resonance and stability due to delocalized pi electrons. This cyclic structure contributes to its distinct chemical properties.
Step 6
Would you expect compound E to have a high octane number? Explain your answer.
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Answer
Yes, compound E is expected to have a high octane number due to its instability and resistance to knocking, which is characteristic of aromatic compounds. The presence of a benzene ring typically enhances combustion efficiency.
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