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apne comments band kar doge to ye ladai yahi band ho jayegi , doodh ka dhula koi nahi ...plz close this topic...and i request to moderators to block this thread ....
see this link it may help u.......
http://www.chemgapedia.de/vsengine/vlu/vsc/en/ch/12/oc/vlu_organik/aromaten/reaktionen/reaktionen_aromaten.vlu/Page/vsc/en/ch/12/oc/aromaten/reaktionen/ar_sn/mechanismus/mechanismus.vscml.html
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