The compound that is not an isomer of 2,2,4-trimethylpentane is
A - VCE - SSCE Chemistry - Question 4 - 2011 - Paper 1
Question 4
The compound that is not an isomer of 2,2,4-trimethylpentane is
A. octane.
B. 3-ethylhexane.
C. 2,4-dimethylheptane.
D. 2,4-dimethylhexane.
Worked Solution & Example Answer:The compound that is not an isomer of 2,2,4-trimethylpentane is
A - VCE - SSCE Chemistry - Question 4 - 2011 - Paper 1
Step 1
Identify the structure of 2,2,4-trimethylpentane
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Answer
2,2,4-trimethylpentane is a branched alkane with the molecular formula C7H16. Its structure has two methyl groups attached to the second carbon and one methyl group attached to the fourth carbon of a pentane backbone.
Step 2
Analyze option A: octane
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Answer
Octane (C8H18) is a straight-chain alkane that has a different molecular formula compared to 2,2,4-trimethylpentane, making it not an isomer.
Step 3
Analyze option B: 3-ethylhexane
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Answer
3-ethylhexane has the same molecular formula (C8H18) and its structure can form from isomers of heptane, indicating it is an isomer, as it shares the same carbon count.
Step 4
Analyze option C: 2,4-dimethylheptane
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Answer
2,4-dimethylheptane has the molecular formula C8H18 also and can be classified as an isomer due to structural similarities to heptane.
Step 5
Analyze option D: 2,4-dimethylhexane
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Answer
2,4-dimethylhexane (C8H18) shares the same molecular formula and different structural arrangement, confirming that it is also an isomer.
Step 6
Conclusion
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Answer
Considering the analyses, the only option that is not an isomer of 2,2,4-trimethylpentane is A: octane.
