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Topic: Please help ! {UV absorbtion}  (Read 3005 times)

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Offline Markleahy

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Please help ! {UV absorbtion}
« on: January 27, 2013, 12:49:41 AM »
The compound below expected to have an absoption at the longest wavelength in its ultraviolet-visible spectrum is

a) 1,3-cyclohexadiene

b) benzene

c) 1,3,5-hexatriene

d) 1,3,5,7-octatetraene

*MOD Edit -- add descriptive title*
« Last Edit: January 27, 2013, 09:17:25 AM by Arkcon »
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Offline Markleahy

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Re: Please help !
« Reply #1 on: January 27, 2013, 01:52:30 AM »
I think it's D . because it has 4 double bonds but I'm not sure .
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Offline discodermolide

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Re: Please help !
« Reply #2 on: January 27, 2013, 01:58:07 AM »
Ys, it's d and it is called a bathochromic shift see http://goldbook.iupac.org/B00618.html
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Offline Markleahy

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Re: Please help ! {UV absorbtion}
« Reply #3 on: January 27, 2013, 11:10:23 AM »
discodermolide Thank you for the link . It was helpful :)
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