When an auxochrome is attached to a chromophore, a) it shifts to longer wavelengths. b) it shifts to shorter wavelengths c) it increases absorption intensity d) wavelength remains constant
Question
When an auxochrome is attached to a chromophore, a) it shifts to longer wavelengths. b) it shifts to shorter wavelengths c) it increases absorption intensity d) wavelength remains constant
Solution
When an auxochrome is attached to a chromophore, it results in a bathochromic shift, which means it shifts the absorption to longer wavelengths. This is because the auxochrome, which is a group of atoms attached to the chromophore, increases the ability of the chromophore to absorb light, particularly in the visible region of the light spectrum. Therefore, the correct answer is a) it shifts to longer wavelengths.
In addition, the presence of an auxochrome also increases the intensity of absorption, making the color appear more intense. So, c) it increases absorption intensity is also correct.
b) it shifts to shorter wavelengths and d) wavelength remains constant are not correct. The presence of an auxochrome causes a shift to longer wavelengths, not shorter, and it does not leave the wavelength unchanged.
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