A short section of a polymer molecule is shown below - VCE - SSCE Chemistry - Question 19 - 2006 - Paper 1
Question 19
A short section of a polymer molecule is shown below.
−CH₂CF₂CH₂CF₂CH₂CF₂CH₂−
This polymer could have been formed from
A. CF₂CH₂ only.
B. CF₂CF₂ and CH₂CH₂.
C. CF... show full transcript
Worked Solution & Example Answer:A short section of a polymer molecule is shown below - VCE - SSCE Chemistry - Question 19 - 2006 - Paper 1
Step 1
A. CF₂CH₂ only.
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Answer
The structure
−CH₂CF₂CH₂CF₂CH₂CF₂CH₂− indicates that there are multiple CF₂ groups in the polymer chain. Therefore, this option cannot account for all the CF₂ units present.
Step 2
B. CF₂CF₂ and CH₂CH₂.
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Answer
Using both CF₂CF₂ and CH₂CH₂ can potentially create the repeating units seen in the polymer structure. This is a plausible option.
Step 3
C. CF₂CF₂ and CH₃CHCF₃.
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Answer
While this option introduces different components, it does not explain the presence of all the CF₂ groups accurately, as the structure shows only CH₂ groups involved in the polymer formation.
Step 4
D. CH₃CHCF₂ and CF₂CHCF₂.
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Answer
This option accounts for both CH₂ and CF₂ groups, but also doesn’t completely correspond with the observed structure of the polymer.
