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Topic: chem(plz help me bcoz i am very silly  (Read 2481 times)

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Offline timchai

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chem(plz help me bcoz i am very silly
« on: March 02, 2009, 03:15:23 AM »
http://uwants.com/viewthread.php?tid=7703106&highlight=%2Btimchai
 i think the ans is due to sterlic hinderance ,can u help me to solve
http://uwants.com/viewthread.php?tid=7698438&highlight=%2Btimchai
i don't know the position , which time we use 1,3 or 1,2 and 1,4
http://uwants.com/viewthread.php?tid=7700284&highlight=%2Btimchai
i can 't find information about Polymorphism
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