Explain irradiation go from e to z rather than the other way

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Reference no: EM13514874

We are enabling trans to cis isomerizaton of E-1,2-dibenzoylethylene by irradiating the alkene with light. Which alkene is more stable, the E or Z isomer above? why does irradiation go from E to Z rather than the other way around? how will the Rf values from TLC compare?

Reference no: EM13514874

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