Which isomer of C6H14 would have the fewest signals in 13C NMR?
A - HSC - SSCE Chemistry - Question 12 - 2022 - Paper 1
Question 12
Which isomer of C6H14 would have the fewest signals in 13C NMR?
A.
H H H
H C---C---C H
H H H
B.
H
H C H
H | H
H--C---C H
H H
C.
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Worked Solution & Example Answer:Which isomer of C6H14 would have the fewest signals in 13C NMR?
A - HSC - SSCE Chemistry - Question 12 - 2022 - Paper 1
Step 1
Identify the isomers of C6H14
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Answer
The isomers presented are:
A: Straight-chain isomer with no branching.
B: Branched isomer with potential for symmetry.
C: Another branched structure but with distinct groups.
D: A branched structure that is symmetrical.
Step 2
Determine the number of unique carbon environments
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Answer
The number of unique carbon environments can be inferred based on the structure and branching of each isomer:
Isomer A has 6 unique environments due to no symmetry.
Isomer B has 4 unique environments as branches reduce signals.
Isomer C has 4 unique environments with some symmetrical positions.
Isomer D has only 3 unique environments due to high symmetry.
Step 3
Conclusion
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Answer
Based on the analysis, Isomer D has the fewest signals in 13C NMR, with a total of 3 unique carbon environments.
