Butanoic acid is the simplest carboxylic acid that is also classified as a fatty acid - VCE - SSCE Chemistry - Question 7 - 2016 - Paper 1
Question 7
Butanoic acid is the simplest carboxylic acid that is also classified as a fatty acid. Butanoic acid may be synthesized as outlined in the following reaction flow ch... show full transcript
Worked Solution & Example Answer:Butanoic acid is the simplest carboxylic acid that is also classified as a fatty acid - VCE - SSCE Chemistry - Question 7 - 2016 - Paper 1
Step 1
i. Draw the structural formula of but-1-ene in the box provided.
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Answer
The structural formula of but-1-ene is:
H H
\ /
C=C
/ \
H H
|
C
|
H
This represents a four-carbon alkene with a double bond between the first and second carbons.
Step 2
ii. State the reagent(s) needed to convert but-1-ene to Compound Y in the box provided.
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The reagent needed for the conversion of but-1-ene to Compound Y is:
H<sub>2</sub>O (water)
H<sub>2</sub>PO<sub>4</sub> (acid catalyst)
This reaction involves hydration of the alkene to form an alcohol (butanol).
Step 3
iii. Write the systematic name of Compound Y in the box provided.
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The systematic name of Compound Y is 1-butanol (or butan-1-ol). This alcohol contains a hydroxyl group (-OH) attached to the first carbon of the butane chain.
Step 4
iv. Write the semi-structural formula of butanoic acid in the box provided.
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The semi-structural formula of butanoic acid is:
O
||
C
/ \
H H
| |
H C
| |
H H
This represents a four-carbon carboxylic acid with a carboxyl group (-COOH) at one end.
Step 5
v. Write a balanced half-equation for the conversion of Cr<sub>2</sub>O<sub>7</sub><sup>2-</sup> to Cr<sup>3+</sup>.
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The balanced half-equation for the reduction of dichromate ion to chromium(III) ions is:
