This is just class participation credit. Our teacher does not explain or teach.

Question

This is just class participation credit. Our teacher does not explain or teach. Could someone explain for thymine, pyramiding, and cytosine: a) how many atomic p orbitals overlap to form the delocalized system of pi molecular orbitals, b)how many bonding and non bonding electrons are in the delocalized system and if there are any electrons in no bonding orbitals that are not a part of the delocalized system for each one. And give me an idea of how to rank the molecules in 5. My guess is D,A, C, B. Thymine Structure and Ultraviolet Spectrum 39 F 3.8 3.7 3.6 35 34 3.3 3.1 NH 30 240 260 Wavelength (nm) 280. Pyrimidine Structure and Ultraviolet Spectrum 3.2 2.8 2.4 220 240 260 Wavelength (nm) 280.

Explanation / Answer

UV absorption wavelength depends on the transition of electrons from non-bonding and pi bonding orbitals to anti-bonding pi orbitals.

The more the pi orbitals are delocalized the more faraway they are separated - means more energy requires for the transition, in other words shorter wavelength.

Therefore, considering the compounds given,

D- will have the lowest wave length followed by C, A and highest B.

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