4-hydroxybenzoic acid
4-hydroxybenzoic acid can react with alcohols to form compounds known as parabens - Scottish Highers Chemistry - Question 11 - 2015
Question 11
4-hydroxybenzoic acid
4-hydroxybenzoic acid can react with alcohols to form compounds known as parabens.
(a) Name the functional group circled in the structure of ... show full transcript
Worked Solution & Example Answer:4-hydroxybenzoic acid
4-hydroxybenzoic acid can react with alcohols to form compounds known as parabens - Scottish Highers Chemistry - Question 11 - 2015
Step 1
Name the functional group circled in the structure of 4-hydroxybenzoic acid.
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Answer
The functional group circled in the structure of 4-hydroxybenzoic acid is the carboxyl (acid) group.
Step 2
Name the type of reaction taking place when parabens are formed.
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Answer
The reaction taking place when parabens are formed is called esterification or condensation.
Step 3
Draw the paraben formed when 4-hydroxybenzoic acid reacts with ethanol.
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Answer
The structure of the paraben formed from the reaction of 4-hydroxybenzoic acid with ethanol is shown below:
O
||
-C-
/ \
C C
| |
H H
\ /
C
|
H
The ethyl ester of 4-hydroxybenzoic acid is formed.
Step 4
State a conclusion that can be drawn from the information in the table.
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Answer
As molecular size (number of carbon atoms) increases, the absorption of parabens decreases.
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