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Electronic spectra of conjugated dye and test of free electron model

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Which of the following types of compounds are typically coloured due to their electronic spectra?

a: Alkanes Explanation

Explanation

b: Alcohols Explanation

Explanation

c: Aldehydes Explanation

Explanation

d: Conjugated systems Explanation

Explanation

Which of the following is an example of a n-π* transition?

a: A transition from a bonding π orbital to an antibonding π* orbital Explanation

Explanation

b: A transition from a non-bonding n orbital to a bonding π* orbital Explanation

Explanation

c: A transition from a non-bonding n orbital to an antibonding π* orbital Explanation

Explanation

d: A transition from a bonding π orbital to a non-bonding n orbital Explanation

Explanation

How does the presence of a substituent affect the electronic spectra of a conjugated dye?

a: It has no effect on the spectra Explanation

Explanation

b: It shifts the absorption bands to longer wavelengths Explanation

Explanation

c: It shifts the absorption bands to shorter wavelengths Explanation

Explanation

d: It can have either a blue or a red shift, depending on the nature of the substituent Explanation

Explanation

Which of the following types of compounds would be expected to have the highest molar absorptivity?

a: Conjugated systems with many alternating double bonds Explanation

Explanation

b: Conjugated systems with few alternating double bonds Explanation

Explanation

c: Compounds with only single bonds Explanation

Explanation

d: Aromatic compounds Explanation

Explanation

What is the relationship between the energy of an electronic transition and the wavelength of light absorbed or emitted?

a: They are directly proportional Explanation

Explanation

b: They are inversely proportional Explanation

Explanation

c: There is no relationship Explanation

Explanation

d: The relationship depends on the nature of the transition Explanation

Explanation

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