Is there a sure shot way of telling whether a reaction is cis addition or trans addition? [closed]








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For example we say Hydrogenation in cis addition , by looking at a reaction and analyzing can we say whether it’s cis/trans addition? Or Is it purely on the basis of experiments we say it’s cis/trans




there cannot be a way in which you can always say whether a reaction is cis- addition or trans- addition just by looking at the reaction unless you know its mechanism or the fact itself and mechanism is proposed using the experimental facts. So experiment is the ultimate source. 


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