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8. Answer the questions below with reference to the compounds A – D in the table on the right - Leaving Cert Chemistry - Question 8 - 2009
Question 8
8. Answer the questions below with reference to the compounds A – D in the table on the right. (a) Give the IUPAC name for each of the compounds A – D. (12) (b) Na... show full transcript
Worked Solution & Example Answer:8. Answer the questions below with reference to the compounds A – D in the table on the right - Leaving Cert Chemistry - Question 8 - 2009
Step 1
Step 2
Name the family (homologous series) of organic compounds to which compound B belongs. Name the aromatic compound, found in almond kernels, that has the same functional group as compound B.
Answer
Compound B belongs to the family of saturated aldehydes (or alkanals). The aromatic compound found in almond kernels that has the same functional group is benzaldehyde.
Step 3
Which of the compounds A – D is present in concentrations of about 40% (v/v) in whiskey? Which of the other compounds is formed as the primary metabolite of this compound in the human body?
Answer
Compound A (Ethanol) is present in whiskey at about 40% (v/v). The primary metabolite of ethanol in the human body is compound B (Ethanal).
Step 4
Describe what is observed when a small amount of sodium carbonate is added to a test tube containing an aqueous solution of compound C. Write a balanced equation for the reaction.
Answer
When sodium carbonate is added to an aqueous solution of compound C (Ethanoic acid), effervescence occurs due to the release of carbon dioxide gas. The balanced equation for the reaction is:
ightarrow ext{CH}_3 ext{COONa} + ext{H}_2 ext{O} + ext{CO}_2 + ext{NaHCO}_3 $$Step 5
Step 6
Draw the full structural formula for compound D and clearly label each carbon atom that has tetrahedral geometry.
Answer
The full structural formula for compound D (Ethyl ethanoate) is as follows:
O
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C-C-O-C
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H H
In this structure, each carbon atom that is connected to four other atoms (including bonds) is labeled to indicate tetrahedral geometry.