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Answered 2013-04-04 08:12:38

Because , Cis isomer are same group on same side of the c=c bond . & those are bulky group on the same side , they are formed steric repulsion to each other then Cis isomer are less stable than trans isomer is same group of opposite side of c=c bond no formation of steric repulsion to each other. and trans isomer is more stable than Cis isomer.....

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