Questions: NUCLEAR MAGNETIC RESONANCE (NMR) SPECTRA 1. Type of hydrogen: chemical shift 2. Relative numbers of hydrogens: integration

Transcript text: NUCLEAR MAGNETIC RESONANCE (NMR) SPECTRA 1. Type of hydrogen: chemical shift 2. Relative numbers of hydrogens: integration

Solution

Solution Steps

Step 1: Identify the different types of hydrogens

Benzaldehyde has two types of hydrogens: the aldehyde hydrogen and the aromatic hydrogens.

Step 2: Analyze the chemical shifts

The aldehyde proton appears as a singlet near 10 ppm, deshielded due to the electron-withdrawing nature of the carbonyl group. The aromatic protons appear between 7-8 ppm as a complex multiplet due to their coupling with each other.

Step 3: Analyze the integration

The aldehyde proton integrates to 1H, while the aromatic protons integrate to 5H, consistent with the structure of benzaldehyde.

Final Answer:

Type of hydrogen: chemical shift
- Aldehyde proton: ~10 ppm (singlet)
- Aromatic protons: 7-8 ppm (multiplet)
Relative numbers of hydrogens: integration
- Aldehyde proton: 1H
- Aromatic protons: 5H

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