Which statement (s)is/are wrong about the interconversion of trans - and cis- isomeric alkenes by ultraviiolet radiation with a suitable photosensitiser ?

Which statement (s)is/are wrong about the interconversion of trans - a

1.	Which statement (s)is/are wrong about the interconversion of trans - and cis- isomeric alkenes by ultraviiolet radiation with a suitable photosensitiser ?
Answer» `U.V.` radiation provides energy to excit `pi bar(e)` into an anti`-` bonding `pi` molecular orbital `(pi ^(**) ABMO)` MOMENTARILY breaking the `pi-` bond. Rotation about the `(C-C)` single bond of either excited `cis-` or TRANS `-` MOLECULE gives a common non `-` planar intermediat. When the `bar(e)` returns to the ground state, the `pi-`bond reforms and the same MIXTURE of the two geometric isomers results from either STARTING isomer. Because the rate of return from the common intermediat to the cis`-` ground state is faster , the `cis-`predominates even though is has the higher energy. The product ratiois kinetically controlled and not thermodynamically controlled. Because the rate of returnfrom the common intermediate to the trand `-` ground state is faster, the trans`-` predominates and has lesser energy. The product ratio is thermodynamically controlled and not kinetically controlled. Answer :d.