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Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3, and C4 of butanone attributable to spin-spin coupling in its 1H NMR spectrum.
  • a)
    Hs on C1, singlet; Hs on C3, doublet; Hs on C4, triplet.
  • b)
    Hs on C1, singlet; Hs on C3, triplet; Hs on C4, quartet.
  • c)
    Hs on C1, singlet; Hs on C3, quartet; Hs on C4, triplet.
  • d)
    Hs on C1, triplet; Hs on C3, doublet; Hs on C4, triplet.
Correct answer is option 'C'. Can you explain this answer?
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Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3,...
The proton signal splits into n + 1 peaks when the adjacent carbon has n equivalent hydrogens. C1 is the isolated methyl, and C3 is the methylene linked to C4 (methyl) in butanone; Hs on C1, C3, and C4 are a singlet, a quartet, and a triplet, respectively.
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Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3,...
Understanding Butanone's Structure
Butanone, or methyl ethyl ketone, has the chemical structure CH3-CO-CH2-CH3. The hydrogen atoms on the carbon atoms C1, C3, and C4 will exhibit different splitting patterns in the 1H NMR spectrum due to spin-spin coupling.

Multiplicity of Hs on C1
- **C1 (methyl group, CH3)**:
- The hydrogens on C1 are adjacent to the carbonyl group (C=O) and do not have any neighboring hydrogens.
- **Result**: The Hs on C1 appear as a **singlet**.

Multiplicity of Hs on C3
- **C3 (methylene group, CH2)**:
- The Hs on C3 are adjacent to the CH3 group (C1), which contributes two equivalent Hs.
- According to the n+1 rule (where n is the number of neighboring hydrogens), the two Hs on C3 will split into a **triplet** due to the three neighboring Hs from C1.

Multiplicity of Hs on C4
- **C4 (methyl group, CH3)**:
- The Hs on C4 are adjacent to the methylene group (C3), which has two equivalent Hs.
- Following the n+1 rule again, the Hs on C4 will appear as a **triplet** because of the two adjacent Hs from C3.

Conclusion
- Therefore, the correct multiplicities for the hydrogens in butanone are:
- Hs on C1: **singlet**
- Hs on C3: **triplet**
- Hs on C4: **triplet**
This leads to the conclusion that option **C** (Hs on C1, singlet; Hs on C3, quartet; Hs on C4, triplet) is indeed the correct representation of the multiplicities.
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Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3, and C4 of butanone attributable to spin-spin coupling in its1H NMR spectrum.a)Hs on C1, singlet; Hs on C3, doublet; Hs on C4, triplet.b)Hs on C1, singlet; Hs on C3, triplet; Hs on C4, quartet.c)Hs on C1, singlet; Hs on C3, quartet; Hs on C4, triplet.d)Hs on C1, triplet; Hs on C3, doublet; Hs on C4, triplet.Correct answer is option 'C'. Can you explain this answer?
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Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3, and C4 of butanone attributable to spin-spin coupling in its1H NMR spectrum.a)Hs on C1, singlet; Hs on C3, doublet; Hs on C4, triplet.b)Hs on C1, singlet; Hs on C3, triplet; Hs on C4, quartet.c)Hs on C1, singlet; Hs on C3, quartet; Hs on C4, triplet.d)Hs on C1, triplet; Hs on C3, doublet; Hs on C4, triplet.Correct answer is option 'C'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3, and C4 of butanone attributable to spin-spin coupling in its1H NMR spectrum.a)Hs on C1, singlet; Hs on C3, doublet; Hs on C4, triplet.b)Hs on C1, singlet; Hs on C3, triplet; Hs on C4, quartet.c)Hs on C1, singlet; Hs on C3, quartet; Hs on C4, triplet.d)Hs on C1, triplet; Hs on C3, doublet; Hs on C4, triplet.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of (a)-(d) indicates the multiplicities for hydrogens on C1, C3, and C4 of butanone attributable to spin-spin coupling in its1H NMR spectrum.a)Hs on C1, singlet; Hs on C3, doublet; Hs on C4, triplet.b)Hs on C1, singlet; Hs on C3, triplet; Hs on C4, quartet.c)Hs on C1, singlet; Hs on C3, quartet; Hs on C4, triplet.d)Hs on C1, triplet; Hs on C3, doublet; Hs on C4, triplet.Correct answer is option 'C'. Can you explain this answer?.
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