3-Methylbutanal is a compound that is found in low concentrations in many types of food - Scottish Highers Chemistry - Question 4 - 2018
Question 4
3-Methylbutanal is a compound that is found in low concentrations in many types of food. The structure of 3-methylbutanal is shown.
(a) Draw a structural formula fo... show full transcript
Worked Solution & Example Answer:3-Methylbutanal is a compound that is found in low concentrations in many types of food - Scottish Highers Chemistry - Question 4 - 2018
Step 1
Draw a structural formula for a ketone that is an isomer of 3-methylbutanal.
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Answer
A structural formula for a ketone that is an isomer of 3-methylbutanal is 2-pentanone (or pentan-2-one). This can be represented as:
H H
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H--C--C--C--C=O
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H H
Step 2
Name a reagent which could be used to distinguish between 3-methylbutanal and a ketone.
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Answer
A reagent that could be used to distinguish between 3-methylbutanal and a ketone is Fehling's solution or Tollen's reagent. These reagents will oxidize aldehydes but not ketones, allowing differentiation.
Step 3
Name the strongest intermolecular force that occurs between 3-methylbutanal molecules.
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Answer
The strongest intermolecular force that occurs between 3-methylbutanal molecules is the permanent dipole-permanent dipole interaction due to the polar C=O bond.
Step 4
Explain fully what can happen to 3-methylbutanal that will cause the olive oil to develop an unpleasant taste.
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Answer
3-Methylbutanal can undergo oxidation when exposed to air, leading to the formation of a carboxylic acid, which can contribute unpleasant flavors to the olive oil. This process, known as rancidification, changes the flavor profile, making it taste off or sour.
Step 5
Explain why step 1 is described as a condensation reaction.
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Step 1 is described as a condensation reaction because it involves the joining of two molecules (3-methylbutanal and another reactant) with the loss of a water molecule.
Step 6
Give the systematic name for product A.
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Answer
The systematic name for product A is 6-methylheptan-2-one.
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