Question

4. Out of ethyl benzene and styrene, which will absorb at
higher wave length and why?​

Answer 1

Out of ethylbenzene and styrene, the latter one absorbs UV radiation at a higher wavelength.

• Polystyrene exhibits a UV absorption band at around 290 nm in comparison with ethylbenzene.
• Similar absorption bands are also observed for polymers of styrene derivatives.
• Styrene absorbs a higher wavelength of UV radiation because of the presence of associative interaction between pendant phenyl groups.
• Styrene is an organic compound with the molecular formula $C_{8}H_{8}$.
• Styrene is used to make latex, synthetic rubber, and polystyrene resins.
• Ethylbenzene is an organic compound with the molecular formula $C_{8}H_{10}$.
• The ethylbenzene that is naturally found in coal tar and petroleum is used to make styrene.

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Answer 2

Styrene absorbs at a higher wavelength.

• Ethylbenzene absorbs at 268 mμ styrenes absorbs UV at 291 mμ
• Both ethyl benzene and styrene has benzene ring.
• The ethyl group is saturated, it has no double bonds in the chain.
• But in styrene, we have a double bond attached to benzene.
• And this double bond is in conjugation with the benzene ring.
• Due to this conjugation, styrene absorbs at a higher wavelength.
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