Chromophores and Auxochromes

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Questions and Answers

What is the primary function of auxochromes in relation to chromophores?

They modify the light absorption of chromophores. (correct)
They produce color independently of chromophores.
They determine the chemical structure of chromophores.
They serve as the main source of color in compounds.

Which of the following is NOT an example of a chromophore?

Carbonyl groups
Amino groups (correct)
Nitro rings
Carbon-carbon double bonds

Which statement accurately describes chromophores?

They rely solely on auxochromes to exhibit color.
They require elimination of hydrogen to show color.
They are only effective in the absence of any auxiliary groups.
They produce color independently and can include multiple types of groups. (correct)

Which of the following best defines a chromophore?

<p>A molecule responsible for the absorption of light that produces color. (B)</p> Signup and view all the answers

Which combination is an example of both a chromophore and an auxochrome?

<p>Azo group and amino group (B)</p> Signup and view all the answers

Flashcards

Chromophore

The part of a molecule responsible for its color. It absorbs specific wavelengths of light, causing the compound to appear colored.

What are some examples of chromophores?

Examples of chromophores include carbon-carbon double bonds, carbon-nitrogen double bonds, carbonyl, azo, nitro, methine, and quinoid rings.

Auxochrome

Groups of atoms that enhance the color of a chromophore without producing color on their own. They modify the chromophore's ability to absorb light.

Give examples of auxochromes.

Examples of auxochromes include hydroxyl, amino, aldehyde, and methyl mercaptan groups.

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Chromogen

A molecule containing both a chromophore and an auxochrome. This combination results in a more intense and often different color compared to the chromophore alone.

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Study Notes

Chromophores

Chromophores are the molecules primarily responsible for color in a compound.
Examples of chromophores include carbon-carbon double bonds, carbon-nitrogen double bonds, carbonyl, azo, nitro, methine, and quinoid rings.

Auxochromes

Auxochromes are groups of atoms attached to a chromophore that intensify a compound's color.
They do not produce color by themselves; instead, they alter the chromophore's light absorption properties.
Examples of auxochromes include hydroxyl, amino, aldehyde, and methyl mercaptan groups.