Substances that absorb in the UV range are primarily those that contain π electrons or non-bonding electrons (n-electrons) that can be excited by UV light. These include:

1. Aromatic compounds: These compounds have a ring of atoms, usually carbon, with a system of pi electrons. Examples include benzene and naphthalene.

2. Unsaturated compounds: These compounds contain double or triple bonds and can absorb UV light. Examples include alkenes and alkynes.

3. Carbonyl compounds: These compounds contain a carbon-oxygen double bond and can absorb UV light. Examples include aldehydes, ketones, and carboxylic acids.

4. Certain inorganic compounds: Some transition metal complexes and certain ions can absorb UV light.

5. Conjugated systems: These are systems with alternating single and multiple bonds. The more extended the conjugation, the longer the wavelength of light absorbed.

6. Certain polymers: Some polymers, like polyvinyl chloride (PVC), can absorb UV light.

Remember, the specific wavelengths absorbed by a substance will depend on the exact electronic structure of the molecules in the substance.

Question

Substances that absorb in the UV range are primarily those that contain π electrons or non-bonding electrons (n-electrons) that can be excited by UV light. These include:

1. Aromatic compounds: These compounds have a ring of atoms, usually carbon, with a system of pi electrons. Examples include benzene and naphthalene.

2. Unsaturated compounds: These compounds contain double or triple bonds and can absorb UV light. Examples include alkenes and alkynes.

3. Carbonyl compounds: These compounds contain a carbon-oxygen double bond and can absorb UV light. Examples include aldehydes, ketones, and carboxylic acids.

4. Certain inorganic compounds: Some transition metal complexes and certain ions can absorb UV light.

5. Conjugated systems: These are systems with alternating single and multiple bonds. The more extended the conjugation, the longer the wavelength of light absorbed.

6. Certain polymers: Some polymers, like polyvinyl chloride (PVC), can absorb UV light.

Remember, the specific wavelengths absorbed by a substance will depend on the exact electronic structure of the molecules in the substance.

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