**Determining the Matching Structure Based on ^1H-NMR Spectrum****Question:**Which structure best matches the ^1H-NMR spectrum below?**Explanation of the ^1H-NMR Spectrum:**- The ^1H-NMR spectrum presented shows various peaks corresponding to the hydrogen atoms in the molecule under examination.- **Peak Identification:** - A multiplet (several overlapping peaks) near 7.5 - 8.0 PPM indicates the presence of aromatic hydrogen atoms. - A singlet at approximately 5.5 PPM suggests the presence of a hydrogen atom in a less shielded environment.**Structures Available for Matching:**1. **Structure a:** - Benzene ring with two hydroxyl (OH) groups attached. 2. **Structure b:** - Benzene ring with a nitro (NO₂) group and an amino (NH₂) group attached. 3. **Structure c:** - Benzene ring with two hydroxyl (OH) groups attached in meta positions. 4. **Structure d:** - Benzene ring with a nitro (NO₂) group and an amino (NH₂) group attached in ortho positions. 5. **Structure e:** - Benzene ring with two hydroxyl (OH) groups in ortho positions. 6. **Structure f:** - Similar to structure d, it has a benzen ring with a nitro (NO₂) group and an amino (NH₂) group but not at the same positions.**Analysis:**- The aromatic region (7.0 - 8.0 PPM) signifies the hydrogens in an aromatic ring.- The 5.5 PPM singlet may suggest a hydroxyl group on an aromatic ring. **Conclusion:**The best matching structure should show a similar pattern in its hydrogen environment as displayed in the NMR spectrum. Given the singlet at 5.5 PPM and multiplets in the aromatic region, the structure that is likely a match will have hydrogens in similar environments. For educational purposes, matching ^1H-NMR spectra to structures is an excellent exercise in understanding hydrogen environments in various organic molecules.

- correct answer is d The proton NMR splitting is shown here.

Answered: Which structure best matches the 'H-NMR…

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Which structure best matches the 'H-NMR spectrum below?

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL4: Proton (1h) Nmr Spectroscopy

Section: Chapter Questions

Problem 4CTQ

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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.

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